Lessons in Chemistry

Excerpt from Lessons in Chemistry

Some substances are capable of existing in the three possible states, as solid, liquid, and gas. Water is the most common example of such a substance; by the action of more or less heat it can be converted at pleasure into steam, liquid water, or ice. However, if we strongly heat a piece of wood or some sugar, these substances will not be melted into liquids or changed to vapor, but will be transformed into entirely different kinds of matter, from which'we cannot again obtain the original substance.

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