Define pressure. Give the $SI$ and $CGS$ unit of pressure.

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(N/A) Pressure is defined as the force acting normally per unit area of a surface. Mathematically,it is expressed as $P = \frac{F}{A}$,where $P$ is pressure,$F$ is the normal force,and $A$ is the area.
The $SI$ unit of pressure is the Pascal $(Pa)$,which is equivalent to $1 \ N/m^2$.
The $CGS$ unit of pressure is the Barye $(Ba)$,which is equivalent to $1 \ dyne/cm^2$.

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