Question

write the composition of air in earth atmosphere

Answer 1

Air is a mixture of gases - 78% nitrogen and 21% oxygen - with traces of water vapor, carbon dioxide, argon, and various other components.

Air is usually modeled as a uniform (no variation or fluctuation) gas with properties averaged from the individual components.

The water or vapor content in air varies. The maximum moisture carrying capacity of air depends primarily on temperature
The composition of air is unchanged until elevation of approximately 10.000 m
The average air temperature diminishes at the rate of 0.6oC for each 100 m vertical height
"One Standard Atmosphere" is defined as the pressure equivalent to that exerted by a 760 mm column of mercury at 0oC sea level and at standard gravity (32.174 ft/sec2)
Other components in air

Sulfur dioxide - SO2 - 1.0 parts/million (ppm)
Methane - CH4 - 2.0 parts/million (ppm)
Nitrous oxide - N2O - 0.5 parts/million (ppm)
Ozone - O3 - 0 to 0.07 parts/million (ppm)
Nitrogen dioxide - NO2 - 0.02 parts/million (ppm)
Iodine - I2 - 0.01 parts/million (ppm)
Carbon monoxide - CO - 0 to trace (ppm)
Ammonia - NH3 - 0 to trace (ppm)

Answer 2

the earth atmosphere is composed of Nitrogen (78% ) oxygen (21%) , argon (1%) and traces amount of carbon dioxide, Helium ,neon, carbon monoxide ,hydrogen ,Ozone, methane extra. lower altitude also have quantities of water vapours