system
Given the following post, respond as if you're commenting on Reddit:
human
Atmospheric pressure is 14.7 psi - does that mean the true psi of my car tire is the difference of the tire pressure from the atmospheric pressure?
gpt
Normal tire pressure is 30-33 psi.  We describe that as "Gauge" pressure.  The "Absolute" pressure would be 30-33 + 14.7 psi, which is the pressure in the tire and the pressure of the atmosphere.

Therefore the pressure in the tire is 44.7-47.7 psi (a)