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A mean heat capacity is quoted between two temperatures because

  • A.its value depends on the averaging interval
  • B.heat capacity has no meaning at one temperature
  • C.the reference state must always be stated
  • D.the pressure changes between the two values

Answer: A

The same substance has different mean capacities over different ranges, so a value without its interval cannot be used. Tables usually fix one end at a reference such as twenty-five degrees Celsius. Two mean values may be combined to cover another interval.

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