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The direction of heat flow between two objects depends on

  • A.Their masses
  • B.Their heat contents
  • C.Their temperatures
  • D.Whether they are in solid, liquid or gaseous state

Answer: C

Heat flows according to the temperatures of the two objects.

It always passes from the hotter to the colder body, whatever their masses or heat contents, until both reach the same temperature. This is the content of the second law of thermodynamics, and the reason the zeroth law makes temperature meaningful.

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