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25 December, 14:45

You fill a tank with gas at 30°C and 101.5 kPa and seal it. You decrease the temperature to 10°C but keep the volume constant. What happens to the pressure? (Careful!

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  1. 25 December, 16:03
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    Assume that the gas that fills the tank is ideal for us to be able to use the ideal gas law.

    PV = nRT

    When V, n, and R are all constant, we can say that,

    (T1) (P2) = (T2) (P1)

    We convert temperature into kelvin (This is the portion where we have to be very careful not using the degrees Celsius).

    (30 + 273) (P2) = (10 + 273) (101.5 kPa)

    The value of P2 is 94.8 kPa.
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