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3 October, 07:30

The guage pressure in an automobile tire reads 32 psi in

thewinter at 273 K. The guage reads the difference between thetire

pressure and the atmospheric pressure (14. psi). Inother words, the

tire pressure is the guage reading plus 14.7psi. If the same tire

were used in the summer at 316 K and noair had leaked from the

tire, what would be the tire guage readingin the summer?

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Answers (1)
  1. 3 October, 07:45
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    Tire gauge reading = 40.0 psi

    Explanation:

    We can solve this question by making use of Gay Lusac law which says that the pressure of a gas is directly proportional to the absolute temperature (K) of the gas:

    P₁/T₁ = P₂/T₂ ⇒ P₂ = (P₁/T₁) x T₂

    Notice that we have to assume the volume of the tire remains constant which is a reasonable assumption.

    P₁ = (32 + 14.7) psi = 46.7 psi

    T₁ = 273 K

    P₂ = ?

    T₂ = 316 K

    P₂ = (46.7 psi / 273 K) x 316 K = 54.06 psi

    Gauge reading = 54.06 psi - 14.07 psi = 40.0 psi psi
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