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Change is a difference from the current state. For example, water changes to steam, when it is boiled and hence has a change of state from liquid to gas. 

When talking about change in physics or chemistry, we refer to physical change or chemical change. A physical change does not involve a change in chemical composition of the material and is usually visible. For example, when we heat a solid metal (such as iron), it melts and changes from solid to liquid (a change of state), yet it still stays iron metal. On the other hand, chemical changes involve change in chemical composition. For example, when we burn fuel (such as gasoline, diesel, etc.) in our vehicles, gases such as carbon dioxide, sulfur oxides, etc. are generated and a change in chemical composition occurs. Chemical changes are generally evidenced by gas emission, heat release, precipitation, etc. 

A number of other changes take place in our day to day life. We see difference in level of light and call it day and night (and morning and evening). We feel change in temperature and call it summer or winter, etc.

Hope this helps. 

Approved by eNotes Editorial Team
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