The bottom layer is the layer closest to the earth. It’s also the densest of the five layers. This layer of the atmosphere is known as the troposphere. Humans live in the troposphere. It’s a layer of the Earth’s atmosphere where humans live and breathe.

The troposphere starts at the Earth’s surface and extends to a height of about ten kilometres.

In the troposphere, the air is about 12,500 feet above sea level and has a temperature of about 75 degrees Fahrenheit. This is the layer of air where clouds form because almost all the water in the atmosphere is found there.

Layer number 1 is a mixture of mostly nitrogen (78%), oxygen (21%), and argon (0.9%). Trace gases (carbon dioxide, nitrous oxides, methane, and ozone) account for another tenth of a per cent.

Img source: NASA

What Influences the Temperature of Troposphere

The temperature of the troposphere varies because it is heated primarily by outgoing longwave radiation. This means that the temperature for this layer of the atmosphere, which is closest to Earth’s surface, is primarily determined by what happens on Earth’s surface and in the lower atmosphere. The troposphere is also important because it encompasses all weather phenomena and makes up 70% of Earth’s atmosphere.

Composition of Troposphere

Dry air is made of 2.08% nitrogen, 3.95% oxygen, and 4.93% argon. Nitrogen makes up the bulk of dry air, while oxygen and argon are light gases. Dry air is a non-reactive gas that consists of approximately 5.95% oxygen and 6.05% nitrogen.


When you go up in altitude, the atmospheric pressure decreases, which means the air pressure is no longer equal to the weight of the air above a certain point on the planetary surface. In this case, the “certain point” is the top of the mountain where you are. Therefore, the air pressure at the top of the mountain is less than the air pressure at the bottom of the mountain. This decrease in air pressure at high altitudes is known as the “barometric pressure gradient.

The layer we call home

Earth’s closest to the surface is called the troposphere. It’s where most of the air is in our atmosphere. “Tropos” means change. This layer is called the “Molecular Layer” and gets its name from the fact that it is the least dense of the three atmospheric layers and it is constantly changing and evolving as the result of interaction with the gases above it.

The troposphere is the lowest layer of the atmosphere, which is 5-9 miles (8-14 kilometres) thick. Yes. It’s true. All other things being equal, the distance between two points on a Mercator projection is thinnest at the North and South Poles.

This layer covers the surface of Earth and contains all of the clouds that we see in the sky. The air is the heaviest in this lowest layer of the atmosphere. In fact, the troposphere is where three-quarters of the mass of the entire atmosphere is located. The air in the room is 78 per cent nitrogen and 21 per cent oxygen. The last 1% of the atmosphere is made of argon, water vapour, and carbon dioxide.

When you feel the breeze on your face, see the clouds in the sky, and see a bird flap its wings in flight, you’re experiencing the stratosphere.

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