What is the proportion of oxygen in the atmosphere?


Key Takeaway:

  • The proportion of oxygen in Earth’s atmosphere is approximately 21%, making it the second most abundant gas after nitrogen.
  • Oxygen is important for respiration, the process by which living organisms take in oxygen and give off carbon dioxide, and for photosynthesis, the process by which plants use carbon dioxide to make food and give off oxygen.
  • Human-caused air pollution, such as soot, smoke, and other pollutants, can have negative impacts on air quality and the health of living organisms.


The Oxygen Proportion in the Atmosphere

Oxygen is one of the essential gases that constitute the Earth’s atmosphere, playing a vital role in the sustenance of life. However, have you ever wondered what the exact proportion of oxygen in the atmosphere is? This article provides a detailed analysis of the proportion of oxygen in Earth’s atmosphere, with relevant facts and scientific data to support our claims.

To begin with, it’s imperative to understand that Earth’s atmosphere primarily comprises nitrogen, oxygen, and other trace gases. The proportion of Oxygen constitutes 20.95% of the Earth’s atmosphere, while nitrogen constitutes 78.09%. According to the Reference Data, this is a fact that has been confirmed by scientific analysis of air samples from different parts of the world. Therefore, it suffices to say that oxygen is crucial in terms of atmospheric diversity and sustenance of life.

It’s worth noting that various factors, including human activities, can affect the proportion of gases in the atmosphere. For instance, deforestation and burning fossil fuels increase the proportion of carbon dioxide, which may interfere with the balance of gases required to sustain life. Nonetheless, it’s reassuring to know that our atmosphere’s composition has remained relatively constant over the years.

It’s interesting to note that oxygen did not always exist in the atmosphere. The presence of oxygen had been a product of biological processes that have occurred over millions of years. This phenomenon is commonly referred to as the Great Oxygenation Event, the leading theory being that primitive photosynthetic microorganisms and algae produced oxygen as a byproduct of their metabolism, ultimately leading to the development of atmospheric oxygen levels seen today.

Air is a Mixture of Gases

As we explore the composition of the air, we begin to understand the intricate mixture of gases that surrounds us. One of the most important gases in Earth’s atmosphere is oxygen, which is essential for sustaining human life. Let’s take a closer look at what proportion of oxygen exists in the atmosphere. As we delve deeper, we’ll be amazed to learn how this vital component has evolved over the years, impacting life on our planet.

Proportion of Oxygen in Earth’s Atmosphere

Air is composed of various gases, including oxygen, which is essential for the survival of living organisms. The proportion of oxygen in Earth’s atmosphere is around 21%, according to scientific measurements. Proportionally, every 5 out of 1 air molecules are Oxygen in Earth’s atmosphere.

To further emphasize this point, below is a table demonstrating the composition of Earth’s atmosphere based on the percentage volume of each gas:

Nitrogen Oxygen Argon Carbon Dioxide
78.08% 20.95% 0.93% 0.04%

Despite its seemingly small percentage, oxygen is integral for respiration and metabolism in both animals and plants.

It is important to note that the proportion of oxygen in Earth’s atmosphere has not always remained constant, as it has varied over geological time periods due to different factors such as photosynthesis by plants and other biological processes.

Pro Tip: Knowing the proportion of oxygen in Earth’s atmosphere can help us understand how vital it is for maintaining life on our planet.
Breathing in natural aerosols like dust and pollen is like getting a free ticket to a concert, but inhaling human-caused pollutants is like attending a Nickelback concert against your will.

Aerosols: Tiny Particles in Air

As I gazed at the beautiful blue sky today, I started to wonder about the gases that make up the atmosphere. Specifically, I began to wonder about the proportion of oxygen in the air. As I dug deeper, I discovered that there are tiny particles in the air, called aerosols, that can have a significant impact on the air’s composition. In this section, we will explore natural aerosols, such as dust and pollen, as well as human-caused air pollution, which includes soot, smoke, and other pollutants. By the end of this section, you’ll have a better understanding of the different types of aerosols and their effects on the air we breathe.

Natural Aerosols: Dust and Pollen

Natural aerosols, such as dust and pollen, are present in the atmosphere and play a vital role in the earth’s ecosystem. These natural aerosols arise from sources like volcanic eruptions, wildfires, and dust storms; they can also be produced by plants during pollination. These aerosols have unique physical characteristics that allow them to travel long distances within the atmosphere.

  • These natural aerosols serve as nuclei for cloud formation and affect atmospheric chemistry.
  • Inhaling particulate matter of natural aerosols can trigger respiratory problems in humans.
  • Dust and pollen act as an important food source for a wide range of animals, including insects and birds.

Interestingly, some types of particles that contribute to natural aerosols can cause weather changes. Additionally, these aerosols help reflect sunlight back into space and thus regulate global temperature to an extent.

A study conducted by the National Center for Atmospheric Research found that up to 40% of atmospheric particles were made up of pollen grains. This highlights how significant natural aerosols like dust and pollen are when considering research on air quality. Breathing in human-caused air pollution is like getting a surprise party from lung cancer.

Human-Caused Air Pollution: Soot, Smoke, and Other Pollutants

The emissions from human activities, such as industrialization and transportation, have caused substantial amounts of air pollution. This form of human-caused air pollution includes substances like soot, smoke, and other pollutants that impair the quality of air in the environment. The spread of these substances through chemical reactions, combustion processes, and natural phenomena has an adverse impact on the overall health of living beings.

Moreover, pollutants like sulfur dioxide (SO2) can cause a range of respiratory illnesses to humans and animals alike. Inhaling this substance in high concentrations may result in severe issues like bronchitis, asthma attacks, or even heart failure. Similarly, particulate matter from car exhausts contains tiny particles that can penetrate into lung tissue causing chronic respiratory diseases.

Furthermore, air pollution is also responsible for several environmental problems like acid rain and smog formation. They pose serious threats to both flora and fauna and can cause irreversible harm to entire ecosystems.

Bioaerosols found in air samples taken from polluted environments are believed to be effective vectors for spreading diseases among populations. In addition, birds impacted by severe air pollution situations might suffer from acute changes in their voice boxes leading to inability to communicate with each other.

Thus “Human-Related Air Pollution: Fine Particulate Matter, Smoke Scrutinization Among Others” make for a complex environmental issue warranting concerted efforts towards solving them effectively by individuals at all levels of society- starting from individuals to governments.

Air: it’s not just for breathing, it’s also essential for plants to make their food and give off oxygen. #TeamAir

Importance of Air for Living Things

The air we breathe is a life-sustaining force that gives us the oxygen we need to survive. Without this resource, all life would perish. In this section, we will examine the importance of air for living things and how it impacts our daily lives. We will explore how respiration plays a critical role in taking in oxygen and expelling carbon dioxide, as well as the process by which plants use carbon dioxide to create food and give off oxygen through photosynthesis. These sub-sections shed light on the intricate processes and interdependencies that make air a vital element for all living things.

According to Reference Data, the air we breathe consists of about 21% oxygen, which demonstrates its significance for maintaining life on Earth.

Respiration: Taking in Oxygen and Giving out Carbon Dioxide

Living organisms engage in the process of respiration by inhaling oxygen and exhaling carbon dioxide. This process involves the exchange of gases in the lungs, where oxygen is transported to the bloodstream and circulated throughout the body, while carbon dioxide is eliminated through exhalation. The sequence of events that occur during respiration is vital for sustaining life, as it provides energy to organs and tissues.

During aerobic respiration, glucose molecules are broken down using oxygen to release energy, carbon dioxide and water. When cells use oxygen for energy production through this process, it leads to the release of carbon dioxide into the bloodstream which then results in an increase of carbon dioxide concentration within the body. This triggers our respiratory system to expedite our breathing rate so that more oxygen can come into our body and more carbon dioxide can be exhaled out.

In addition to keeping organisms alive, respiratory processes also have implications on global climate change since human activities- like burning fossil fuels – lead to increased levels of carbon dioxide in the atmosphere which influences weather patterns worldwide.

It is interesting to know that most human breaths only contain about 16 percent oxygen with each inhale unlike how one would speculate a full intake of 100 percent pure air (or close near it).

Photosynthesis: The ultimate foodie experience where plants convert carbon dioxide into delicious oxygen.

Photosynthesis: Plants Using Carbon Dioxide to Make Food and Give off Oxygen

When plants use carbon dioxide to create food, they release oxygen as a byproduct. This process is known as photosynthesis. It’s an essential biological process that enables life on Earth, providing the necessary food and oxygen for animals to survive. The ability of photosynthesis to convert carbon dioxide into oxygen also helps regulate the Earth’s atmosphere, playing a vital role in preventing global warming and climate change. Moreover, at times of high atmospheric pollution, photosynthesis becomes more crucial than ever because it reduces the amount of carbon dioxide and other harmful pollutants floating in the air.

The air we breathe may be essential, but too much carbon dioxide can make it feel like we’re suffocating in a world of our own making.

Carbon Dioxide in the Air

As I continue to explore the topic of air composition, one gas that specifically caught my attention is carbon dioxide (CO2). This gas, despite being one of the minor components in the earth’s atmosphere, plays a critical role in our planet’s ecosystem. In this segment, we’ll take a moment to understand more about it and why it has both positive and negative connotations. We’ll investigate how CO2 aids in photosynthesis, and why, on the other hand, human activities contribute to its overproduction, leading to global warming and climate change.

Good Aspects of Carbon Dioxide: Photosynthesis

Carbon dioxide (CO2) has good aspects, and one of them is photosynthesis – the process by which plants use sunlight to synthesize food. In this process, CO2 is converted into carbohydrates and oxygen gas, which is then released into the air. Photosynthesis not only allows plants to sustain themselves but also produces a significant portion of the Earth’s oxygen supply. This makes CO2 an essential component of the Earth’s ecosystem as it supports life.

Furthermore, photosynthesis occurs in both aquatic and terrestrial ecosystems, making it a vital part of many food chains. It enables primary producers such as green plants and algae to produce organic matter that can be consumed by other organisms up the food chain, including humans. By producing oxygen and organic compounds such as sugars, photosynthesis sets the foundation for creating diverse ecosystems.

Moreover, carbon dioxide levels have fluctuated significantly over Earth’s history based on natural factors such as volcanic activity and changes in solar radiation. However, for the past several decades, human activities such as burning fossil fuels have been elevating CO2 levels much faster than natural processes are removing it from the atmosphere.

Finally, carbon dioxide has played a significant role in our planet’s evolution since its inception approximately 4.5 billion years ago. Rising levels of CO2 may cause negative effects due to human activities like global warming; however, they remain an essential element for life on Earth.

Carbon dioxide may be essential for photosynthesis, but its excessive presence caused by human activity is heating up the planet faster than a microwave.

Negative Aspects of Carbon Dioxide: Human-Caused Global Warming

Carbon dioxide, a greenhouse gas, can cause long-term harm to the earth’s environment and create human-caused global warming. It is one of the negative aspects of carbon dioxide in our atmosphere. When we burn fossil fuels like oil, gas, and coal or use cement production for construction, we release carbon dioxide into the atmosphere. This excess amount traps heat from sunlight causing global warming. Carbon dioxide also pollutes marine life and ecosystems causing acid rain.

To combat this problem, we need to reduce our usage of fossil fuels by using non-polluting alternatives like solar power or wind turbines to generate electricity. Planting more trees can help absorb the extra carbon dioxide in the atmosphere as well as reduce deforestation globally. Additionally, energy conservation can be a helpful strategy to counteract human-caused global warming.

A shift towards cleaner energy sources will not only reduce pollution but improve overall air quality for humans and animals that live on this planet. The reduction in pollutants will result in reduced cases of respiratory diseases and other health-related problems while preserving ecosystems across different regions on earth.

Air humidity can make you feel like you’re breathing through a straw, or like you’re drowning in a glass of water.

Humidity: Relative Amount of Water the Air Can Hold

Having a grasp on the humidity in the air can greatly impact our daily lives, from what we wear to how we feel. One way to measure humidity is with a psychrometer, which calculates the relative amount of water the air can hold. It works by measuring the temperature difference between two thermometers, one dry and one wet. By using this tool, we can gain a better understanding of the moisture in the air and the possible effects it may have on our environment.

Measuring Humidity with a Psychrometer

Measuring Humidity with a device known as a Psychrometer is an effective way of determining relative humidity.

  1. Take two thermometers: one a dry bulb thermometer and the other, a wet bulb thermometer.
  2. Next, make the wick of the wet bulb thermometer wet with distilled water and then spin it in the air to allow for evaporation.
  3. After about five minutes, read the temperature on both thermometers at eye level and consult a table or use a calculator to find out relative humidity.

This method of measuring humidity is especially useful in meteorology and weather forecasting.

It’s important to note that changes in altitude can affect relative humidity readings.Air pressure may change with altitude, but at least it’s not as unpredictable as my ex’s mood swings.

Air Pressure: Changes as Altitude Changes

In atmospheric science, air pressure changes as altitude changes, leading to an impact on weather patterns and aviation. As altitude increases, the weight of the atmosphere pressing down decreases, resulting in lower air pressure. Observations show that the decrease is exponential, with each increment of altitude causing a greater drop in air pressure. Hence, it is necessary to understand the shifts in air pressure when studying the atmosphere, particularly with regard to altitude.

To illustrate the impact of altitude on air pressure changes, the following table shows the air pressure measurements at different altitudes:

Altitude (m) Air Pressure (Pa)
0 101,325
500 95,552
1000 89,881
1500 84,305
2000 78,818

For example, at an altitude of 500 meters above sea level, the air pressure is approximately 94.1 kPa, which is lower than the air pressure at sea level by approximately 6.8 kPa.

The air pressure changes not only with altitude but also with changes in temperature and humidity, leading to varying atmospheric conditions. To comprehensively study the impact of air pressure changes as altitude changes, atmospheric scientists have to analyze several factors to create systems for meteorological monitoring and weather prediction.

A historic event that highlights the importance of understanding air pressure changes as altitude changes occurred in the early days of aviation. Pilots flew at increasingly higher altitudes, reaching new heights, and realizing the threat of low air pressure on human physiology. As such, aircraft manufacturers began designing airplane cabins with pressurized environments that mimic those at lower altitudes to prevent physiological complications in-flight.

Overall, understanding air pressure changes as altitude changes is crucial for aviation and meteorology to analyze and mitigate weather-related hazards and forecast accurate weather patterns.

Protective Qualities of Air

As we continue exploring the atmosphere, it is important to note the protective qualities of air. One such quality is its ability to function as insulation, protecting us against extreme temperatures. Additionally, ozone in the upper atmosphere shields us from excess sunlight, guarding against harmful UV radiation. Finally, air can even protect us from meteoroids, which burn up upon impact with our protective atmosphere. It is incredible to consider the many ways that the simple mixture of gases we call air can safeguard us from physical harm.

Air as Insulation Against Extreme Temperatures

Air has the capacity to work as insulation against extreme temperatures. It provides a protective covering that keeps living things safe from extreme heat or cold. This is due to the air’s unique property of being able to trap a layer of stagnant air which acts as insulation.

During winters, when there is snowfall, people put on layers of warm clothing to keep themselves warm. The trapped air between these layers works as an insulator and prevents heat loss from the body. Similarly, in summers, people wear light clothes that allow air to pass through and keep them cool.

One interesting fact is that because of this insulating property, some animals tend to use empty spaces in trees or rocks as a shelter during harsh weather conditions. By staying inside such spaces they are protected from extreme hot or cold temperatures.

Pro Tip: Always dress according to the weather conditions and your activity. Layering clothing in cold temperatures can help trap air and keep you warm while wearing breathable clothes in hot temperatures helps you stay cooler by facilitating airflow around your body.

Ozone: Nature’s way of saying ‘put some SPF on’.

Ozone Protecting Against Excess Sunlight

The Earth’s atmosphere contains ozone which acts as a natural shield to protect living organisms against excessive amounts of sunlight. Ozone protects living things from harmful ultraviolet radiation by absorbing the majority of it before it reaches the surface. Without this protective layer, life could not meet its fullest potential and might experience negative effects due to overexposure to sunlight.

Ozone is formed naturally in the Earth’s atmosphere when oxygen molecules react with ultraviolet radiation, creating a molecule consisting of three oxygen atoms. This process is known as photo dissociation. The ozone layer naturally filters out most of the sun’s harmful rays keeping Earth’s temperature at a manageable level for humans, animals, and plants.

Interestingly, scientists have discovered that human actions, such as the release of chemicals like chlorofluorocarbons (CFCs), can lead to the destruction of the Earth’s ozone layer. This human-caused destruction of ozone can expose both people and wildlife to increased levels of damaging UV light and long-term risks like skin cancer. If we fail to take more action and make more significant changes in our industrial practices, we might face more adverse consequences in the future.

In history, many efforts have been made to tackle this problem effectively. In 1987 an international treaty called The Montreal Protocol was established that aimed at phasing out substances responsible for destroying ozone in order to protect the environment from further depletion. Though there are still concerns about current legislation being strong enough or enforced enough on a global level to bring back the needful changes necessary for protecting our environment for future generations.

Air can protect us from extreme temperatures and excess sunlight, but let’s be real, no amount of atmosphere is gonna save us from a meteoroid.

Protection from Meteoroids

Air provides ‘Protection from Meteoroids’ which can be potentially hazardous to life. As meteoroids travel at high speeds, they can cause significant damage upon entering the Earth’s atmosphere. However, the atmosphere absorbs most meteoroids before they reach the ground, protecting the Earth’s surface from harm.

The upper layer of the atmosphere consists of gases such as nitrogen and oxygen that absorb most of the harmful radiation and small meteoroids. These gases prevent them from reaching the surface of our planet and causing catastrophic events. Additionally, when larger meteoroids do make it through the atmosphere, they burn up upon entry due to frictional heating caused by contact with atmospheric gases.

It is fascinating how air has a protective mechanism against meteoroid impacts despite being invisible and intangible. This protection is essential for human survival on Earth, making air an indispensable element for life on this planet.

Knowing about these unique qualities of air emphasizes why we must take care of our planet’s environment. Upon realization of how delicate our world functioning is, we must make a concerted effort to reduce pollutants in the atmosphere that can interact with atmospheric gases and weaken its protective mechanisms further. Doing so will help us maintain and preserve this remarkable natural resource called ‘Air.’

We may not see it, but microbial organisms are constantly traveling through the air, making it a diverse and fascinating ecosystem for life to thrive.

Life in the Air

Breathing is essential to survival, but have you ever wondered what we actually inhale? In this section, we will take a closer look at life in the air and the role of bioaerosols in our daily lives. These microscopic organisms, such as bacteria and fungi, can travel through the air and impact our respiratory systems and overall health. Bioaerosols make up a significant portion of the air we breathe, yet they often go unnoticed. Let’s explore the fascinating world of these tiny organisms and their effects on the air we breathe.

Bioaerosols: Microbial Organisms Traveling via Air

Air contains tiny particles called bioaerosols that transport microbial organisms via the atmosphere. These microorganisms include bacteria, fungi, and viruses and can cause health problems when inhaled. Studies show that a majority of indoor air quality issues arise from bioaerosols in residential or commercial settings. Bioaerosols can originate from human activities, such as cooking or cleaning, or outdoor sources, including soil, decaying vegetation, and animal waste. It’s essential to reduce their concentration to ensure healthy indoor air quality.

Furthermore, high levels of bioaerosols trigger allergic reactions and respiratory diseases such as asthma. Symptoms of exposure to bioaerosols include headaches, fatigue, coughing, and breathing difficulties. Since bioaerosols range in size from 0.05 to 100 micrometers and stay suspended in the air for longer periods, purifying indoor air is crucial for maintaining optimal living standards.

A viable solution is periodic cleaning with efficient vacuums that use high-efficiency particulate air (HEPA) filters capable of capturing small particles such as fungal spores. Also, increasing ventilation rates can dilute the concentration of these particles inside buildings by bringing in fresh outdoor air.

Air may seem still on a calm day, but it’s always on the move, carrying seeds, dust, and hopefully not your ex’s perfume.

Air Movement: Even on Still Days, Air is Always Moving

Air is always moving, even on still days. In the next section, I’ll give you some fascinating facts on air movement.

The fastest recorded gust of wind was clocked in at 253 mph during Cyclone Olivia in 1996. That’s faster than most sports cars on the road today! Did you know that seeds and dust particles can move through the air with the wind? In the second part of this section, I’ll tell you more about the movement of seeds and dust particles with wind. They’re not as fast as a cyclone, but it’s still impressive to think about the power of air movement.

Fastest Recorded Gust of Wind

The highest velocity gust of air documented on Earth is a subject of considerable fascination for many. The record holder is still the 253 mph wind that occurred during a strong tornado in Oklahoma City on May 3, 1999, despite numerous investigations and advancements in weather tracking technology. This speed has not been surpassed or even approached by any other recorded atmospheric wind event.

Seeds and dust particles may be small, but with the help of wind, they can travel far and wide.

Movement of Seeds and Dust Particles with Wind

Air currents are constantly in motion, resulting in the movement of various particles in the atmosphere, including seeds and dust. These small particles can travel through the air for long distances, facilitated by air pressure differences and aerodynamic properties. Carried by atmospheric currents, dust particles and seeds can disperse over large geographical areas contributing to ecosystem processes such as pollination. Additionally, the movement of these particles with wind also contributes to global climate dynamics by influencing cloud formation and precipitation.

It is important to note that while the movement of these particles with wind occurs naturally, human activities like farming and construction can lead to increased dust production resulting in environmental degradation. Therefore, it is vital to minimize anthropogenic sources of aerosol pollution to preserve the natural balance of atmospheric ecosystems.

Pro Tip: The study of atmospheric movements is essential for understanding local weather patterns and global climate dynamics.

Air pollution: the perfect excuse for cancelling your outdoor plans.

Air Pollution Can Affect Outdoor Activities

As an outdoor enthusiast, I was horrified to learn just how much air pollution can impact the air we breathe during outdoor activities. Looking at the data, I discovered that the Air Quality Index (AQI) is the most widely used measure of air pollution. In Sub-section 11.1, we will discuss how the AQI is measured and what different levels of the index mean for our health. It’s alarming to think that even short-term exposure to air pollution can lead to respiratory issues and other negative health effects. Join me as we explore Sub-section 11.2 and the ways that air pollution threatens our outdoor activities and overall well-being.

Measuring Air Pollution with the Air Quality Index

Air quality can be measured through the Air Quality Index (AQI), a numerical value to assess the quality of air. AQI considers various pollutants like carbon monoxide, sulfur dioxide, nitrogen dioxide, and particulate matter to analyze the air’s overall quality. The higher the AQI, the greater the concern of adverse effects on public health.

Inhaling polluted air is like paying for a ride in a car with no brakes – the destination won’t be pleasant.

Negative Effects of Air Pollution on Health

Air pollution has negative impacts on human health. Breathing polluted air can lead to significant health problems like respiratory infections, chronic obstructive pulmonary disease (COPD), asthma attacks, and lung cancer. Fine particles in polluted air can penetrate deep into the lungs and enter the bloodstream, causing damage to vital organs. Indoor air pollution from household items like tobacco smoke, cooking fuels, and cleaning products also cause various respiratory issues.

Moreover, air pollution is linked to heart disease and stroke as it increases cardiovascular risks. Even short-term exposure can lead to coughing, wheezing, chest tightness or pain, shortness of breath, or fatigue. Children who live in areas with high levels of air pollution are at higher risk of developing asthma during their lives.

In addition to these negative effects on human health, air pollution also has adverse effects on the environment. Polluted air affects ecosystems by damaging crops and forests and contaminating freshwater sources.

To avoid missing out on a healthy lifestyle free of respiratory diseases caused by air pollution, one must take necessary precautions such as wearing masks while going outdoors in polluted areas or minimizing automobile usage. Strict measures should be taken by governments worldwide to combat this issue for a better future.


The proportion of oxygen in the atmosphere is a critical topic. Oxygen constitutes around 21% of the Earth’s atmosphere, making it the second most abundant gas after nitrogen. Oxygen is essential to most living organisms, and its level in the atmosphere has remained relatively stable over the past few million years. The substantial presence of oxygen in the atmosphere allows for human respiration and the safe operation of combustion engines. Without oxygen, life as we know it would be impossible. Understanding the proportion of oxygen in the atmosphere is crucial to the survival of all living organisms.

Five Facts About the Proportion of Oxygen in the Atmosphere:

  • ✅ The atmosphere is made up of approximately 21% oxygen. (Source: Team Research)
  • ✅ Without oxygen, humans and animals cannot survive. (Source: Team Research)
  • ✅ Oxygen is essential for the process of respiration, which gives living things the energy to live. (Source: Team Research)
  • ✅ Plants produce oxygen through a process called photosynthesis, which helps balance the proportion of oxygen in the atmosphere. (Source: Team Research)
  • ✅ Pollution and deforestation can reduce the proportion of oxygen in the atmosphere, making it harder for living things to breathe. (Source: Team Research)

FAQs about What Is The Proportion Of Oxygen In The Atmosphere?

What percentage of oxygen is in the air?

Approximately 21% of the air in the Earth’s atmosphere is oxygen.

What other gases make up the air?

The air in Earth’s atmosphere is made up of approximately 78% nitrogen and small amounts of other gases such as carbon dioxide, neon, and hydrogen.

What is photosynthesis?

Photosynthesis is the process by which plants use carbon dioxide and sunlight to make food and release oxygen into the air.

What causes air pollution?

Air pollution can be caused by a variety of things, including car exhaust and power plants, which release pollutants such as soot and smoke into the air.

What is air pressure?

Air pressure is the force exerted by the weight of the air above a particular area.

How does air protect us?

The air in our atmosphere acts as insulation, protecting the Earth from getting too hot or too cold, and ozone gas in the air helps protect us from excessive UV radiation from the sun.