Types of pressure

Types of pressure

Generally, pressure means force acting per unit area. The pressure can be further studied as the following :

a. Absolute pressure :

It is the pressure measured relative to the pressure of a vacuum or it shows how high, the given pressure is than vacuum pressure.

b. Gauge pressure :

It is the pressure measured relative to the atmospheric pressure or it shows how high, the given pressure is then that of atmosphere.

P­_Gauge = P_abs - P_atm

c. Vacuum pressure :

It is the pressure less than atmospheric pressure and is measured relative to atmospheric pressure.

P_Vacuum = P_atm - P_abs

Units of pressure

1 Pa = 1 N/m²

1 KPa = 1000 Pa

1 atm = 101.325 KPa

1 bar = 100 KPa

1 MPa = 10⁶ Pa