What is Atmospheric pressure?

What is Atmospheric pressure

The pressure of air that can support 760 mmHg column at sea level is called one atmosphere.

OR

It is a force exerted by 76 cm long column of mercury on an area of 1 cm2 at 0°C.

Atmospheric Pressure at Sea Level:

It is the average pressure of atmosphere at sea level. i.e.; 760 mmHg.

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