Forum Discussion
DrewE
Oct 06, 2021Explorer II
The 5 psi gain suggests that the air temperature in your tire increased by very roughly 17C or 30F -- perfectly reasonable.
(That's based on the ideal gas law: PV=nRT, or pressure * volume = quantity of gas * ideal gas constant * absolute temperature. In the case of a tire, the volume and quantity of gas don't change appreciably, and of course the ideal gas constant is also constant. Hence, the change in (absolute) pressure is directly proportional to the change in (absolute) temperature.)
(That's based on the ideal gas law: PV=nRT, or pressure * volume = quantity of gas * ideal gas constant * absolute temperature. In the case of a tire, the volume and quantity of gas don't change appreciably, and of course the ideal gas constant is also constant. Hence, the change in (absolute) pressure is directly proportional to the change in (absolute) temperature.)
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