Question

atmospheric pressure decreases with the height and temperature explain.

Answer 1

Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in theatmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.

Answer 2

For earth, the source of heat is earth as it receives the energy directly from the sun, atmosphere can’t absorb this energy. Thus, for atmosphere, earth is the source of heat and therefore, as we move away in altitude, the temperature falls. Actually, sun radiates heat energy in the lower infrared regions (being at a temperature of~ 6000K), which can not be captured by the atmosphere and this energy is received by the earth. Thus for lower 10 km regions, practically it is the earth that is the source of heat in the troposphere.

Secondly, the role of pressure is there, as we move up into the atmosphere, pressure falls. Thus, any vertical movement by air leads to expansion and expansion causes cooling. Due to these two factors, we feel a strange situation-going towards sun and yet feeling colder as we move up in altitude.