Thermodynamics: The 2016 advent calendar
Day 4

If A equals B...

A simple illustration of an important law.

If A is in thermal equilibrium with B, and B is in equilibrium with C, then A will also be in equilibrium with C.

This mantra lies at the base of the four laws of thermodynamics. This simple illustration of a simple law will help wrap your mind around this fundamental principle of energy, before the advent calendar dives into the first law with tomorrow's instalment.

More about the zeroth law