Solids, liquids, gases

The relationship between energy and states of matter is sometimes difficult for students to comprehend. This activity helps to reinforce the notion that, when energy is added to a system, the molecules themselves do not change but their motion and relative positions do change.

While the model is a simplification, it helps students to understand how energy is transferred from hot places to colder places; how heating and cooling are related to changes of state; and how the molecules of a substance behave in different states.

 

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