Imagine a pile of coins. Now imagine a smaller pile of coins. Now imagine an empty pile of coins (no coins). In the physical sense, can you have fewer coins than no coins? (You could owe money, but you can’t put negative coins on a table)
Heat is the same way. The smallest amount of heat is no heat (it’s called absolute zero). You can say that one thing is colder than another (one pile of coins is smaller than another), but it just means that the colder place has less heat.
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