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Time constant

  1. Mar 29, 2005 #1
    A room has temp at +22 degrees C, and after 8 hours it has fallen to 15. What is the rooms "time constant" when the outdoor temp is -5 C? I have no idea what is beeing asked about here, could someone help me...?
    Last edited: Mar 29, 2005
  2. jcsd
  3. Mar 29, 2005 #2


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    The time constant of a system is the time taken for the relevant quantity (in this case, the temperature) to decrease to 1/e (about 36.8%) of its initial value.

    - Warren
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