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Nuclear fusion reactor in South Korea runs at 100 million degrees C for a record-breaking 48 seconds
(www.livescience.com)
this post was submitted on 06 Apr 2024
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They usually measure extreme high temperatures differently, not with thermometers based on heat expansion of materials. They measure heat radiated, not conducted.
In plain English, they look at it with a heat camera, like you see on TV they patrol borders with.