Question

How to denote the SI unit of pressure?

Answer 1

Pressure and its units:

1. Pressure is defined as the force applied per unit area.
2. $P=\frac{F}{A}$ where $F$ is the force applied and $A$ is the area,
3. Pressure can be measured using the following standard units:

3.1 The unit of force is $N$ and the unit of area is $m^2$, hence the derived unit of pressure is $N/m^2$.

3.2 This is also termed as the SI unit of pressure is pascal or $Pa$.

3.3 The atmospheric pressure is measured in $1atm$ which is equivalent to $760mm$ of $Hg$.

3.4 $1atm$ is also termed as $1bar$ of pressure.

3.5 $1bar={10}^{5}Pa$

Hence, the SI unit of pressure is Pascal or is denoted as $Pa$.