Great for elementary and middle school as an intro to new material. The flow of heat was a mystery to scientists for a very long time and to explain it, they created a substance called caloric that flowed invisibly between different objects. In this article, students will read how we now know that heat is just the vibration of molecules and that it can only be transferred from a hot object to a cold one.
Vocab words: caloric, heat flow, energy, transfer
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