Question

Define atmospheric pressure?How it is vary with altitude

Answer 1

Answer:

Atmospheric pressure, is the pressure within the atmosphere of Earth.

Pressure with Height: pressure decreases with increasing altitude. The pressure at any level in the atmosphere 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.

So, as we go up at higher altitude the pressure decreases. 

Answer 2

The pressure exerted by the atmosphere is called the atmospheric pressure.

Explanation:

• The surrounding  of air around us is called atmosphere.

• The atmosphere is made up of lot of molecule of air.

• Due to weight of molecule of air  atmosphere also contain weight.

• Due to weight the atmosphere exerts thrust on the surface of the earth .

• The thrust exerted on unit area of earth surface due to weight of the molecule of air is called the atmospheric pressure on the earth surface.

• Atmospheric pressure vary with altitude :-
• As the altitude increases, the atmospheric pressure decreases because the volume of air particles starts decreasing and its density also starts to decrease, due to which the atmospheric pressure decreases very much there and the altitude decreases. At the same time, the density of air molecule becomes high due to which the atmospheric pressure also becomes high.