Located between about 50 and 80 kilometers (31 and 50 miles) above Earth's surface, the mesosphere gets progressively colder with altitude. In fact, the top of this layer is the coldest place found within the Earth system, with an average temperature of about minus 85 degrees Celsius (minus 120 degrees Fahrenheit).
Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases. The atmosphere also includes water vapor.
Layers of the atmosphere
- The Troposphere. This is the lowest part of the atmosphere - the part we live in.
- The Stratosphere. This extends upwards from the tropopause to about 50 km.
- The Mesosphere. The region above the stratosphere is called the mesosphere.
- The Thermosphere and Ionosphere.
- The Exosphere.
- The Magnetosphere.
The thermosphere is often considered the "hot layer" because it contains the warmest temperatures in the atmosphere.
You should understand that most of the gases in the atmosphere are nitrogen and oxygen.
Composition of the atmosphere.
| Permanent Gases | Gas Name | Nitrogen |
|---|
| Chemical Formula | N2 |
|---|
| Percent (by Volume) Dry Air | 78.08 |
|---|
| Variable Gases | Gas (and Particles) | Water Vapor |
|---|
The air in our atmosphere has some variable components to it as well. These variable components include water vapor, dust particles, and ozone. Although these are found in small amounts, they can have significant effects on weather and climate. The amount of water is the atmosphere varies between 1 and 4%.
Carbon dioxide and oxygen are the gases in the atmosphere that are needed for life.
The final layer of Earth's atmosphere, where it gradually gives way to outer space, is the exosphere. This layer extends from around 440 miles above Earth to nearly 6,200 miles.
Six gases, however, resisted every attempt at liquefaction and were thus known at the time as permanent gases. The noble gases, helium, neon, argon, krypton, and xenon, not yet discovered. Of the known permanent gases, oxygen and nitrogen, the primary constituents of air, received the most attention.
If methane is to be stripped out of the atmosphere, taking advantage of natural air flow provides a viable solution. Natural processes destroy roughly 10% of the methane in the atmosphere every year6.
The major constituents of Earth's heterosphere are nitrogen, oxygen, helium, and hydrogen. Nitrogen and oxygen compose the lower portion of the heterosphere. In the higher levels of the heterosphere, above about 1,000 km, helium and hydrogen are the dominant species present.
Characteristics of troposphere
- it is the first atmospheric layer closet to Earth's surface.
- the troposphere is the region where weather occurs.
- the temperature of troposphere decreases with an increase in height.
- the troposphere makes up approximately 75% of Earth's atmosphere by mass.
What's our atmosphere made of?
- Nitrogen — 78 percent.
- Oxygen — 21 percent.
- Argon — 0.93 percent.
- Carbon dioxide — 0.04 percent.
- Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
D. Nearly all of the Earth's atmosphere is made up of only five gases: nitrogen, oxygen, water vapor, argon, and carbon dioxide. Several other compounds are also present. Although this CRC table does not list water vapor, air can contain as much as 5% water vapor, more commonly ranging from 1-3%.
Earth's atmosphere is roughly 78 percent nitrogen and 21 percent oxygen, with trace amounts of water, argon, carbon dioxide and other gases. No other planet in the solar system has an atmosphere loaded with free oxygen, which is vital to one of the other unique features of Earth: life.
What's our atmosphere made of?
- Nitrogen — 78 percent.
- Oxygen — 21 percent.
- Argon — 0.93 percent.
- Carbon dioxide — 0.04 percent.
- Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
ozone layer, also called ozonosphere, region of the upper atmosphere, between roughly 15 and 35 km (9 and 22 miles) above Earth's surface, containing relatively high concentrations of ozone molecules (O3).
What is the ozone layer? The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 15–30km above the earth's surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun.
' Nitrogen makes up 78 per cent of the air we breathe, and it's thought that most of it was initially trapped in the chunks of primordial rubble that formed the Earth. When they smashed together, they coalesced and their nitrogen content has been seeping out along the molten cracks in the planet's crust ever since.
The Occupational Safety and Health Administration, OSHA, determined the optimal range of oxygen in the air for humans runs between 19.5 and 23.5 percent.
Nitrogen and oxygen are the two major constituents of the atmosphere gases.
Compared to O, N is 4 times as abundant in the atmosphere. Nitrogen is not stable as a part of a crystal lattice, so it is not incorporated into the solid Earth. This is one reason why nitrogen is so enriched in the atmosphere relative to oxygen.
So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.
The Kármán line, an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which entered into force on 10 October 1967.
