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Using the sun to heat a liquid

  1. Sep 17, 2011 #1
    1. The problem statement, all variables and given/known data

    Is it possible to use the heat of the sun to heat a liquid (arbitrary liquid) to a temperature that is hotter than the sun, say 5 times hotter?

    2. Relevant equations
    Concepts in thermal equilibrium

    3. The attempt at a solution
    My answer is no since you can't get more heat from what is not there. On the other hand, if you can focus the energy from the sun then this is where I am unsure.

    Thanks
     
  2. jcsd
  3. Sep 17, 2011 #2
    No, this is not possible, because heating something to be hotter than the source, requires a decrease in entropy (don't have the equation relating to this with me, one that relates S to T), which according to T-D is virtually impossible.
     
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