Quote from: Faust on April 14, 2023, 07:33:11 AM
Nice, congrats man, I've heard of pounds per square inch used, why the fuck change it to foot? To make number bigger?
Realizing I hallucinated answering this:
PSI and foot-pounds are not the same kind of unit. PSI is a measure of pressure: how much weight you feel in pounds per unit surface area in square inches. Foot-pounds is a measure of energy: 1 foot-pound is the amount of energy required to move a mass of one pound one foot in distance.
PSI is good for tire pressure, you can't sensibly measure that in foot-pounds.
Foot-pounds are good for muzzle energy of a firearm cartridge -- PSI could be used sensibly and is used for chamber pressures, but chamber pressure doesn't tell you anything about how fast the bullet is going (a round could have enough pressure to detonate the gun it's fired through without actually moving that bullet very fast).
The respective SI equivalents are Pascals (pressure) and Joules (energy).