Pioneering scientists discovered atmospheric pressure (also known as barometric ... As air becomes less dense, it contains less gases per unit of volume, and therefore less oxygen.

Vapor pressure, along with dew point and relative humidity, is one of many ways to express the amount of water vapor in the ...

Air molecules colliding with a surface cause atmospheric pressure. Atmospheric pressure at sea level is about 101,000 Pa (101 kPa) but just 27,000 Pa (27 kPa) at the cruising altitude of a ...