Zeroth law of thermodynamics
The Zeroth Law of Thermodynamics says that if a change to the temperature(T) from one object (for example 'A') changes the temperature of another object ('B'), and a change to the temperature of 'B' changes the temperature of 'C' (a third object), then a change to the temperature of 'A' will mean a change to the temperature of 'C'. Heat naturally flows from areas that are hot to areas that are cold.
It is called the zeroth (0th) law of thermodynamics because it was discovered after the others, but scholars thought it was more important so they wanted to give it a number before the other laws.
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