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Kingreaper comments on Open thread, October 2011 - Less Wrong
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Was it possible for the ancient Greeks to discover that cold is the absence of heat?
Yes. The relevant experiment would be a study of how gases expand when heated, leading to the ideal gas law, which has a special case at absolute 0.
The special case distinguishes between cold being a real entity (and heat being neg-cold) and heat being a real entity (and cold being neg-heat); because it proves that heat has a minimum, and cold a maximum, rather than the other way around.