**Pascal’s Law states that**: Pressure in a fluid at rest is same at all points which are at the same height. A change in pressure applied to an enclosed fluid is transmitted undiminished to every point of the fluid and the walls of the containing vessel.

In this fig, shows an element in the interior of a fluid at rest. Thus, the fluid exerts pressures P_{a}, P_{b} and P_{c} on this element of area corresponding to the normal forces F_{a}, F_{b} and F_{c} as shown in Fig on the faces BEFC, ADFC and ADEB denoted by A_{a }, A_{b} and A_{c} respectively. Then

Thus,

Hence, the pressure exerted is same in all directions in a fluid at rest. It again reminds us that like other types of stress, the pressure is not a vector quantity. No direction can be assigned to it.

The working of hydraulic lift, hydraulic press and hydraulic brakes are based on Pascal’s law.