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Source on negative Kelvin:https://www.quantum-munich.de/media/negative-absolute-temperature-what-is-it/
In this video I show you what it means to have negative temperature by focusing a laser beam down to a single point. I show you what happens if you try to focus a light down to a single point, then I show you how a laser is different due to population inversion.
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DISCLAIMER: Any experiment you try is at your own risk