# Formula Hydrostatic pressure Hydrostatic pressure    Density    Height / Depth    Gravitational acceleration

## Hydrostatic pressure

Unit
Pressure of the fluid at depth $$h$$ or of the gas at height $$h$$. The fluid (e.g. water) or the gas (e.g. air) exerts a certain force on a square meter.

## Density

Unit
Density of the fluid or gas on which the hydrostatic pressure $$\Pi$$ acts. The denser the fluid or gas, the greater the hydrostatic pressure.

For example, the density of water is: $$997 \, \frac{ \mathrm{kg} }{ \mathrm{m}^3 }$$ and the density of ethanol: $$789 \, \frac{ \mathrm{kg} }{ \mathrm{m}^3 }$$. Thus, at the same depth $$h$$, a greater hydrostatic pressure is established in water than in ethanol.

## Height / Depth

Unit
In the case of fluid (e.g. water), it is the depth measured from the bottom of the sea. In the air atmosphere, for example, it is the height above the ground. In a test tube, it is the height measured from the bottom of the test tube.

## Gravitational acceleration

Unit
Acceleration experienced by any body on Earth. Acceleration due to gravity has the value: $$g = 9.8 \, \frac{\mathrm m}{ \mathrm{s}^2 }$$.