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Heat over time comparison question

  1. Jun 30, 2010 #1
    I have a fairly basic (I hope) question - please note that the values given are just to make the problem easier to comprehend:


    I'm heating, via convection, a constant sized spherical mass (Let's say m=1g) with a consistent surface area (Let's say SA = 1cm^2) at a constant temperature, Tc, (Let's say Tc = 60ºC) for a time, t = 60 minutes. Let us assume that the mass has an initial temperature (Ti) of 20ºC and after 60 minutes the temperature (Tf) of the mass will equal 50ºC. In a similar scenario (m=1g, SA=1cm^2, Ti=20ºC) how long will it take the mass to equal 50ºC if the new constant ambient temperature equals 100ºC?

    Experiment 1:

    m = 1g
    SA = 1cm^2
    Ti = 20ºC
    Tc = 60ºC
    Tf = 50ºC
    t = 60 min

    Experiment 2:

    m = 1g
    SA = 1cm^2
    Ti = 20ºC
    Tc = 100ºC
    Tf = 50ºC
    t = ?? min

    How would I figure this out? Assuming any necessary chemical or physical properties can be found for the mass.

    Any information would be greatly appreciated!
  2. jcsd
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