Name the Lowest Layer of the Atmosphere

By BYJU'S Exam Prep

Updated on: November 14th, 2023

The Lowest Layer of the Atmosphere is the troposphere. The troposphere extends up to about 10 km above ground level (above sea level). This layer acts as a cover of gases around the Earth’s surface. About 75-80% of the atmospheric mass, including clouds, resides in the troposphere. Also, all seasons occur within the lowest layer of the atmosphere.

Lowest Layer of the Atmosphere

The layers of gases enveloping a planet or other celestial body form an atmosphere. Earth’s atmosphere has five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The uppermost or highest layer of the atmosphere among these layers is the exosphere, while the lowest layer is the troposphere.

Here are some details about the lowest layer of the atmosphere:

  • The troposphere extends from land (earth’s surface) up to 10 km above sea level.
  • The uppermost part of the troposphere is known as the tropopause, while the lower part of the crust is known as the boundary layer.
  • About 70 to 75% of air (all gases) is present in the troposphere.
  • About 99% water vapor is present in this layer. Thus, most of the clouds are observed in the troposphere.
  • The air pressure is lowest in the lower layer and gradually increases as you move upwards.
  • Due to the low pressure, the air expands as it moves from the troposphere to the upper layers.
  • Since air expands as it cools, the upper layer of the atmosphere is cooler than the troposphere. The troposphere is the hottest layer of the Earth’s atmosphere.

Layers of Atmosphere

Following are the crucial details related to the layers of the atmosphere:

  • Stratosphere: It lies above the troposphere and extends up to a height of 50 km. The stratosphere is free from clouds and associated weather phenomena. It is the ideal layer for flying airplanes. It contains a layer of ozone gas.
  • Mesosphere: It is the third layer of the atmosphere. The mesosphere lies above the stratosphere and extends up to a height of 80 km.
  • Thermosphere: In this layer, the temperature rises rapidly with increasing height. This layer is important for radio transmission, and it contains the ionosphere.
  • Exosphere: It is the uppermost layer that contains gases like helium and hydrogen. It has very thin air.

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