Question

What is atmospheric pressure?

Answer 1

Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area)


Atmospheric pressure is expressed in several different systems of units: millimetres (or inches) of mercury, pounds per square inch (psi), dynes per square centimetre, millibars (mb), standard atmospheres, or kilopascals.


@skb

Answer 2

Atmospheric pressure is the pressure exerted by the atmosphere (atmospheric column) of the Earth.

1 atm (atmospheric pressure) = 76 cm Hg
=760 mm Hg = 760 torr