The Zeroth Law of Thermodynamics: Thermal Equilibrium

You've heard of the laws of thermodynamics, but did you know there are actually four of them? It's true, and since they already had laws one, two, and three, but then wanted to formulate another more fundamental one, the number right before one is zero so that's what they called it! Also, "zeroth" is fun to say. Let's say it together.

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