What Does PSI Mean for Air Compressors?

By Lucy Crossfield | Editor

Meaning of PSI

PSI refers to pounds per square inch and it is considered the English unit of measure for pressure.

PSI measures how much force is in a certain area. Both force and area have an inverse relationship. As the force increases, pressure increases and where the area increases, pressure decreases.


PSI stands for pounds per square inch. It measures how much force is in a certain area – one pound-force applied to one square inch.


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Lucy Crossfield Editor

Lucy heads up the team on Expert Market, helping to deliver industry-leading expertise on business topics for nearly four years.

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