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Originally Posted by livvie
Ok... here's another math problem. I put in 40psi in a tire under no load. Meaning off the car. I then place the tire on the car and jack the car down. I measure the tire pressure again... guess what? It's the same. I have always thought this to be the case but for the life of me, I can't figure out the math to prove this. Anybody?
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40 psi means 40 units of pressure per square inch(not that you didn't know that), therefore the air inside the tire is exerting 40 psi against the walls of the tire. When the car is then put under load or sat to the ground the amount of pressure in the tire does not change. However, the shape of the tire that holds the air changes shape still exerting 40 psi. When the tire is under load however, it must have more air in the tire to keep the same `shape when not under load.