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  1. #1
    Mike Angelo
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    Yes | No

    Tire pressure and temperature

    Is it true the change in temperature can cause the tires to lose some air pressure? My tire pressure light came on recently when the weather got cold here in NJ and the dealership said the weather caused it.


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    Yes | No

    Yep, PV=nRT..

    P is pressure
    V is volume (constant in a tire)
    n is mass of the air (also constant if you don't mess with the valve)
    R is the gas constant
    T temperature

    P varies directly with T


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    Yes | No

    Re: Yep, PV=nRT..

    A little arithmetic is called for ....
    for a temperature change of 86F to 68F,
    the tire pressure will change from 35psi
    to 34psi.

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    Yes | No

    Actually, T is in degrees Kelvin.....

    meaning degrees above absolute zero (-273 deg C) . At absolute zero, a gas would have no pressure and you get a flat tire (besides being frozen solid)

    86F=303K
    68F=293K

    35psi X 293K/303K = 33.84psi

    Now 86F to 10F (which I am faced with) would result in 31psi if you started at 35psi.

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