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If most matter gets hot as it expands and cools as it contracts, why is it that Freon refrigerant cools down as it goes through expansion?

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If most matter gets hot as it expands and cools as it contracts, why is it that Freon refrigerant cools down as it goes through expansion?	359
Is it risky to eat chicken frozen at 5 deg F instead of 0 deg F?	1