Pressure ($P$) is the force exerted per unit area:
$$ \begin{equation}\begin{aligned} pressure&=\frac{force}{area}\\ P&=\frac{F}{A}\\ \end{aligned}\end{equation} $$The SI unit is the Pascal($Pa$), equivalent to the pressure exerted by applying a one Newton ($1 N$) force over an area of one square-metre ($m^2$):
$$ \begin{equation}\begin{aligned} P&=\frac{F}{A}\\ &\rightarrow \frac{1N}{1 m^2}\\ &=1 Pa\\ \end{aligned}\end{equation} $$Pressure in a fluid
In a fluid, pressure increases with depth. The pressure is also directly proportional to the density, $\rho$ of the fluid as well as acceleration due to gravity, $g$:
$$ \begin{equation}\begin{aligned} P=\rho gh\\ \end{aligned}\end{equation} $$
Hold a focus!
Q1: As a diver dives deeper in a body of water, he/she experiences a lesser pressure
- False
- True
Pressure increases with depth and thus the diver will experience a greater pressure