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# What does PSI stand for?

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PSI stands for pounds per square inch, a unit used to measure pressure. One PSI is equal to the amount of force exerted by a pound of matter in Earth's gravity on an area 1 square inch in size.

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PSI is commonly used to measure the pressure of gases, such as tire pressure in cars as well as fluid pressure in many industrial settings. As it is a nonmetric unit, its use is less common outside the United States and the U.K. In other countries, the SI unit Pascal is used instead, and 1 PSI is equal to 6,894.76 Pascal.

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## Related Questions

• A:

The tire psi (pounds per square inch) rating is found on the side door jam and in the manual of the car. Most vehicles range from 30 to 35 psi, depending on the size and weight of the vehicle.

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• A:

The letters "SL" on the sidewall of a truck tire indicate that the tire is a standard-load tire that holds a maximum load pressure of 35 pounds per square inch. This is the maximum load the tire carries, and manufacturers determine this capacity based on the size of the tire.

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• A:

The term "differential pressure" refers to fluid force per unit, measured in pounds per square inch (PSI) or a similar unit subtracted from a higher level of force per unit. This calculation could be taken for pressures inside and outside a pipe or simply in different places along a flow path. This calculation has applications in the drilling industry.