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Thermal Capacity after mixing

  1. Mar 13, 2016 #1
    Say we have fluid A with thermal capacity C_a and fluid B with C_b. If we create a solution with X% of fluid A and (1-X)% of fluid B, is it true that the new thermal capacity of the mixture will be
    C_new ?= C_a*X + C_b * (1-X)
    Or it is a case-by-case relationship that depends on the nature of the fluids ?

    Thank you
  2. jcsd
  3. Mar 13, 2016 #2


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    Case by case.
  4. Mar 13, 2016 #3
    If A and B form a so-called "ideal solution," then your mixing rule is correct. For a solution to be ideal, the molecular attractions between A and A, B and B, and A and B must be nearly the same.
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