What do you mean by atmospheric pressure? And how it's very with height

Question

Accepted Answer

Atmospheric pressure refers to the force exerted by the weight of the air in the Earth's atmosphere.

Atmospheric pressure is the pressure exerted by the weight of the air above a given point on the Earth's surface.
It is caused by the gravitational attraction of the Earth on the air molecules.
At sea level, the average atmospheric pressure is about 1013.25 millibars or 14.7 pounds per square inch (psi).
As you go higher in the atmosphere, the air becomes less dense and the atmospheric pressure decreases.
For every 1000 feet increase in altitude, atmospheric pressure decreases by about 1 inch of mercury (inHg).

Accepted Answer

The sea level atmospheric pressure is referred as 1 bar. The pressure varies with height because the temprature drops with altitude so that the pressure of air also drops.

What do you mean by atmospheric pressure? And how it's very with height

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