Temperature measures the energy associated with the motion of particles, and absolute zero is where that all stops. It's the "off" state of motion. Absolute zero isn't just an end of the temperature scale; it's the only edge of the temperature scale. The so-called "absolute hot" is a misnomer. It's the temperature at which our current ability to describe thermal energy breaks down, not a limit on thermal energy itself. Calling that point "absolute hot" is like using a child's wooden ruler and calling six inches "absolute length" -- someone trying to sound impressive while clutching an inappropriate tool.
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Absolute zero isn't just a number on the thermometer. It's a boundary on existence, the reference from which everything else starts off and expands out, a perfect point of eternal theory. If we work out warp drive, it'll work from absolute zero. If we play a grand unified symphony on superstring violins, it won't change absolute zero. It's the utter, the ultimate, and we understood it before we understood our own evolution. We knew about entropy's Elysium, the perfect place where there was no toil or waste, before we even knew what entropy was. We found energy's end point before we had fridges, and the former led directly to the latter. We found the bottom of existence, and used that theory to ice our mojitos.
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