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Homework Help: Heat/Temperature Physics Problem

  1. Jul 26, 2005 #1

    Can someone please tell me what I am doing wrong with the following problem. The computer keeps telling me that I am coming up with the wrong answer.

    In a constant-volume gas thermmoeter, the pressure at 18.0 C is 0.980 atm. What is the pressure at 42.0 C?

    I am using the equation (P1/T1) = (P2/T2) and I am solving for P2.

    (P1/T1) = (P2/T2)
    P2 = (P1/T1)(T2)
    P2 = (0.980/18.0)(42.0)
    P2 = 2.29 atm

    I know this is a really simple problem, but I just don't understand what I am doing wrong. Someone please help me.
  2. jcsd
  3. Jul 26, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    For the temperature T, you MUST use the ABSOLUTE temperature, which is measured in Kelvin.
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