What are the three phase changes that require energy to perform?

1 Answer
tcw1
Aug 1, 2017

Fusion (melting), vaporization, and sublimation

Explanation:

When a substance changes states, it requires energy when it goes to a higher energy state and releases energy when it goes to a lower energy state. Gas has a higher energy than liquid and liquid has a higher energy than solid. The three state changes from a lower energy to a higher energy are:

solid to liquid: fusion

liquid to gas: vaporization

solid to gas: sublimation

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