SaM - Different Definitions for Preassure

• differential pressure (so the difference between two pressures)

• absolute pressure, so it’s like taking $p_1$ as $0$ pascal

• gauge pressure, which is a differential pressure where $p_1$ is $1$ atmosphere

• There are many different applications and solutions for primary sensors for pressure, and they depend essentially on the range (preassure ranges) can be very different

• The unit for pressure that should be used is Pascal.

• Actually also Atmosphere is used: one atmosphere is a little more than 100 kilopascal.

• It is also used bar, a bar is exactly 100 kilopascal.

• PSI which is pound per square inch, which corresponds to $6.89\cdot 10^{3}Pa$.