| By including the ideas of different kinds of substance and of chemical change from one kind to another, we arrive at chemistry. |
| Physics is the science of the phenomenon of inanimate matter involving no chemical change. |
| As the lens ages, it increases in weight and thickness, and its proteins undergo a chemical change. |
| When songwriting, he feels he undergoes some sort of chemical change which makes him detached and unresponsive once outside the office. |
| The light from the laser causes a chemical change in the dye coating that shows up as a visible point on the disc. |
| In photo-chemical reactions, a system undergoes a chemical change through the absorption of optical radiation, e.g. ultraviolet radiation. |
