Quote:
Originally Posted by fatoni
it can change the pressure per square inch but not the pressure. if a car weighs 2800lbs, its going to exert 2800 lbs of pressure on the ground no matter what the tire volume is.
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Pressure is defined as force per unit area (lbs/in^2 or N/m^2). You're describing 2800 lbs of
force to the ground, not pressure. Saying "pressure per square inch" is like saying (lbs/in^2)/in^2 or lbs/in^4 which is not a unit of pressure.
Pressure is inversely proportional to the area so if you apply the same amount of force (2800 lbs) to a smaller area, pressure goes up:
2800 lbs/area (in^2) = some pressure (psi)
2800 lbs/smaller area (in^2) = some bigger pressure (psi)