Chemistry / by George Wilson.

  • George Wilson
Date:
1859
Catalogue details

Licence: Public Domain Mark

Credit: Chemistry / by George Wilson. Source: Wellcome Collection.

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    into play—but simply because the diminution of the tempera- ture of a gas lessens the mutual repulsive action of its mole- cules, so that they do not recede so far from each other. 29. All chemical substances, then, whether simple or com- pound, present themselves as solids or fluids, the term fluid being used as a generic or general one to include two spe- cies or kinds, liquid fluids, or liquids, and elastic Jluids, or gases. The same substance often presents itself in all the three forms, according to the temperature at which we exa- mine it; and its chemical properties differ materially accord- ing as it is a solid, a liquid, or a gas. No other example need be given at present than that of water, which at the freezing point is a crystalline solid; at ordinary temperature, a limpid liquid; and at its boiling point, an invisible vapour. Ice, liquid water, and steam, differ strikingly in chemical relations from each other.
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