Definitions (Pressure)

PRESSURE

Pressure: It is defined as the force acting normally per unit area.

Liquid Pressure: The pressure exerted by liquid on the surface of container in which it is kept is called liquid pressure.

Atmospheric pressure: The pressure exerted at sea level by a mercury column of height 760mm is called 1 standard atmospheric pressure.

Hydraulic garage lift: It is a machine used to lift vehicles in service stations during servicing is called hydraulic garage lift.

Hydraulic Brake: It is a braking system based on Pascal’s law that is used in automobiles.

Up-thrust: When a body is partially or wholly immersed in a liquid, the upward force exerted on it by the liquid is called up-thrust.

Density: The mass per unit volume of substance is known as density.

Relative density: It is defined as the ratio of density of object to the density of pure water at 4 °C.

Hydrometer: Hydrometer is the device which is used to measure the specific gravity or relative density of liquid.

Lactometer: The device which is used to measure the purity of milk is called lactometer.