Since PSI is a measure of pressure and GPM is a measure of flow rate, we can not directly convert one into another. One US gallon per minute is approximately equal to 6.309 × 1 0 − 5 m 3 / s 6.309 × 10^ 6.309 × 1 0 − 5 m 3 /s. GPM or gallons per minute is a unit of flow rate, i.e., it specifies how fast a liquid (for example, water) moves through a pipe or pump. It is very commonly used in measuring pressure in industries and everyday life, for example, tire pressure, fire hydrant pressure, etc. One psi is approximately equal to 6894.76 pascals (the SI unit of pressure is pascal or Pa). Thus, a more accurate term for psi would be pound-force per square inch ( lbf/in 2). We can define 1 psi as the pressure due to a force of one pound-force applied on an area of one square inch. PSI or pounds per square inch is a unit of pressure.
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