Title basically. Why is a tire with no air at 0 psi if atmospheric pressure is at 14.7. Donee just not count that and the psi gauges compensate for it? Or is something else going on?
In: Mathematics
Gauges are showing relative pressure. They are showing you the differential between the outside pressure vs. the pressure that is measured by whatever is providing resistance in the gauge. Since we are always assumed to be at 1atm, pressure measurements for most purposes are given relative to that value.
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