The Atmospheric Temperature, Pressure And Density

936 Words Oct 19th, 2016 4 Pages
The atmosphere has a mass of about 4.5 to 5.0×1018 kg. The atmospheric temperature, pressure and density vary considerably with altitude. The atmosphere surrounding the Earth from dangerous cosmic radiations from outer space and helps in sustaining life on the earth. The atmosphere plays a vital role in maintaining the heat balance on the earth by absorbing the infrared radiation received from the sun and re-emitted by the earth. Infact, it is known as “the greenhouse effect”, which keeps the earth warm enough to sustain life on the earth. The atmosphere has broadly three categories like major, minor and traces compounds.
Major components-N2 (78.09%), O2 (20.94%) and water vapour (0.1 to 5%).
Minor components-Argon (0.93%), CO2 (0.32%).
Trace components- Neon, Helium, Methane, Krypton, Nitrous Oxides, Xeon, SO2, NO2, NH3, CO, O3 and I2.
Atmosphere has four segments troposphere, stratosphere, mesosphere and thermosphere.

1. Troposphere: The term “tropo” derived from the Greek word which means “turning over. It extends up to 11 km above from the earth surface and temperature is varies from 15°C to -56°C. The troposphere accounts over 70% of atmosphere mass. Troposphere contains most of the water, cloud and particulate matter of the atmosphere. This layer shows positive lapse rate. Temperature and water vapour content in the troposphere decrease rapidly with altitude. Water vapour plays a major role in regulating air temperature because it absorbs solar energy and thermal…
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