What are the conditions affecting liquid pressure?



If the liquid in a tank remains at rest,the pressure at any location beneath the surface depends on only three conditions.

1.Surface pressure - Any pressure acting on the surface is transmitted throughout the liquid and contributes to the pressure at any location beneath the surface. For example atmospheric pressure if the tank is open.

2.Depth - Pressure is proportional to the depth below the surface. Doubling the depth doubles the pressure.

3.Density - The pressure is proportional to the density of the liquid.

Liquid pressure does not depend on the volume of liquid in the tank.If everything else is the same ,the depth of the liquid,the kind of liquid and the amount of pressure on its surface,the pressure at the same depth will be the same in a large vessel as in a narrow column of liquid.