Pressure is the most common process variable. It must be measured and controlled to ensure safe and efficient operations. Pressure is defined as force per unit area. It can be calculated by dividing the force by the area over which it is applied.

Pressure is measured using three common scales: absolute, gauge, and vacuum. The three common pressure units are atmosphere, psi, and inches of water.

The Principles of Pressure training course explains pressure and how it is measured. It explains how to apply conversion formulas to convert readings from one standard pressure scale to another. This online course covers:

• Factors affecting pressure
• Liquid pressure in a tank
• Gas pressure, volume, and temperature
• Pressure scales
• Pressure conversion

Principles of Pressure is part of the Process Control Variable training series.