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

so as water vapor increases, the density of air decreases. Temperature also changes the density of air. As air gets warmer it expands and becomes less dense, causing atmospheric pressure to fall.

By the time the climber reaches the highest point of Mount Everest, the air pressure is only around 33,700 Pa approximately one third of the atmospheric ... the streams of water escaping from ...

1643: Evangelista Torricelli conducts Berti's experiment with mercury instead of water. This leads to the invention of the barometer, which measures atmospheric pressure (a measure of the pressure ...