When a substance changes from one state to another the identity of the substance stays the same. However the average of kinetic energy changes.For example
Evaporation , boiling is evaporation that happens throughout a liquid at a specific temperature and pressure.Some solids can change to a gas skipping turning into a liquid , this is called
Sublimation , for example Dry Ice .
Energy can be changed to another form of energy.Yet the total amount of energy before the change must equal the total amount of energy after the change.Like mass , energy can not be created or destroyed during a physical or chemical change this is known as
Law Of Conservation Of Energy .
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