GEOLOGY

Detailed explanation-1: -Air density and pressure decrease with increasing altitude.

Detailed explanation-2: -As altitude increases, the amount of gas molecules in the air decreases-the air becomes less dense than air nearer to sea level. This is what meteorologists and mountaineers mean by “thin air.” Thin air exerts less pressure than air at a lower altitude.

Detailed explanation-3: -Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.

Detailed explanation-4: -The term comes from the fact that the density of the air decreases with altitude. A “high” density altitude means that air density is reduced, which has an adverse impact on aircraft performance.

Detailed explanation-5: -Air pressure and density work and change together as you enter different layers of the atmosphere. As the atmosphere expands the further you get from the Earth’s surface, it becomes less dense and air pressure decreases. As you increase altitude (distance from Earth’s surface) in an airplane, air pressure changes.