Regarding heat as a form of energy transfer, which statement is correct?

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1. Regarding heat as a form of energy transfer, which statement is correct?

Any energy transfer that does not involve a temperature difference in some way is not classified as heat

Every energy transfer necessarily requires a temperature difference

An object’s length and volume stay exactly the same as it is heated

Whenever a temperature difference exists, heat is the only possible way energy can transfer

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Heat, specifically, is energy transferred because of a temperature difference. Energy can transfer other ways too, like mechanical work, without any temperature difference at all.