Answer: unit surface area of an object
Pressure is the force [tex]F[/tex] exerted by a gas, a liquid or a solid on a surface (or area) [tex]A[/tex], its unit is Pascal [tex]Pa[/tex] which is equal to [tex]N/m^{2}[/tex] and its formula is:
[tex]P=\frac{F}{A}[/tex]
Therefore in the specific case of a gas:
Gas pressure results from the force exerted by a gas per unit surface area of an object.
