| − | '''Heat''' is generated by the [[kinetic energy]] of a collection of interacting [[particle]]s. <ref>Chemistry Vocabulary: [http://misterguch.brinkster.net/vocabulary.html Heat]</ref> Heat is generally measured in [[joule]]s, though [[calorie]]s and [[BTU]]s are also used as units. | + | '''Heat''' is the transfer of [[energy]] generated by a [[temperature]] gradient. Heat is generally measured in [[joule]]s, though [[calorie]]s and [[BTU]]s are also used as units. |