Question

Air pressure is usually highest when the air is__________.

Answer 1

Hint: Atmospheric pressure, also called barometric pressure, is the force per unit area exerted by an atmospheric column which is the entire body of air above the specified area. When the air settles down in the atmosphere, at that time the force generated by the air over a surface area is the highest respectively.

Complete answer:
The air around us has a specific weight, and the air presses against everything that it touches. That pressure is called atmospheric pressure, or air pressure or the barometric pressure. Air pressure is the force exerted on a surface by the air above it as gravity pulls it to earth. High air pressure is usually associated with fair skies, as in clear weather.

When the air cools down, the density of air gets higher and thus the air gets pushed down. Because of the fact that the air gets pushed down, the pressure of the air gets higher as it leaves more room for more air to fill in that space. As the warm air rises up to fill in that space, it evaporates the moisture in the air that would have made clouds.

Thus for the air pressure to be highest, the weather should be cool and moist.

Note: Atmospheric pressure can be measured with a mercury barometer which shows the height of a column of mercury that exactly balances with the weight of the column of atmosphere over the barometer. Air pressure is the primary cause of winds, as the differences in air pressure between two locations causes wind to flow.