1. Pressure Measurement Many text define the force per unit area exerted by a fluid on its containing wall as a pressure and the force per unit area that arises as a result of a strain in solids as a stress. The units of measure are the same and the strain measurement is often used to infer the pressure.

2. Absolute Pressure: Absolute force per unit area kPa, psia, in H 2 O, mm Hg,... Gage Pressure: Difference between absolute pressure and local atmospheric pressure kPa, psig, in H 2 O, mm Hg, ….

3. Vacuum: When below atmospheric pressure, difference between and absolute pressure and atmospheric pressure kPa; in H 2 0, in Hg Note: Vacuum is normally a “gage” measurement. May sometimes be stated as an “absolute” pressure, especially in SI system

4. 40 kPa absolute Absolute pressure is 40 kPa 40 kPa vacuumAbsolute pressure is: 101.3 kPa - 40 kPa = 61.3 kPa (Assuming local atmospheric pressure is 101.3 kPa)

7. Bourdon Gage

8. Application Range