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Which temperature scale is used in all thermodynamic calculations?

  • A.The Celsius scale, which sets the freezing point of water at zero and the boiling point at one hundred
  • B.The Fahrenheit scale
  • C.The potential temperature scale, in which each parcel is labelled by the temperature it would have at 1000 hectopascals
  • D.The absolute or kelvin scale

Answer: D

The gas law and every other thermodynamic relation require absolute temperature, since ratios and products of temperature appear throughout. Using Celsius in place of kelvin is one of the commonest arithmetic errors in the subject. Potential temperature is itself expressed in kelvin and is a derived variable rather than a scale.

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