Zeroth Law of Temperature

Temperature and heat flow

The Zeroth law of Temperature states that

"Heat flows from one source to an other only if there is a temperature difference between the two.
Two systems are in thermal equilibrium if they are at same temperature."

The law is important for the mathematical formulation of thermodynamics where the relation of thermal equilibrium is the basis for an equivalence relation.

Related Topics

Related Documents

  • Ideal Gas Law - The relations between volume, pressure, temperature and quantity of a gas, including definition of density of a gas.
  • 2nd Law of Thermodynamics - The second law is concerned with entropy, which is a measure of disorder. The second law says that the entropy of the universe increases
  • 1st Law of Thermodynamics - The First Law of Thermodynamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing
  • Third Law of Thermodynamics - The entropy of a substance is zero if the absolute temperature is zero

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