Question

define atmospheric pressure, pressure of gas?​

Answer 1

Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. 

The force which the substance exerts on another substance per unit area is known as pressure. The pressure of the gas is the force that the gas exerts on the container boundaries. The SI unit for Gas pressure is expressed in Pascals (Pa).

Answer 2

Answer:

The pressure that is exerted by the atmosphere is called atmospheric pressure

and The pressure of the gas is the force that the gas exerts on the container boundaries