Heat/Temperature Physics Problem

  1. Hi,

    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. Galileo

    Galileo 1,999
    Science Advisor
    Homework Helper

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