A Pressure Sensor is a device for pressure measurement of gases or liquids. Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. The sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. Pressure is defined as the applied force by a liquid or gas on a surface and it is usually measured in units of force per unit. Pressure Sensor is very useful.