Physical change

In chemistry, a physical change is when a substance undergoes some form of change that does not change the substance at the molecular level (i.e., a chemical change). Physical changes do not create new substances, as in a chemical change, but result in the same substance in a different form or shape. A physical change in which a substance changes states between solid, liquid and gas is called a phase change. When water is frozen into ice, it undergoes a phase change, and thus a physical change, as it is still water, just in a different form. Under normal conditions physical changes can generally be considered reversible, however this does not always hold true.

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