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Cork insulation; a complete illustrated textbook on cork insulation ...

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78<br />

CORK INSULATION<br />

ordinary pressures, and hence follows Gay-Lussac's law quite<br />

closely. The point of importance here is that all gases expand<br />

when heated and c<strong>on</strong>tract when cooled.<br />

Liquids, with notable excepti<strong>on</strong>s, expand when heated and<br />

c<strong>on</strong>tract when cooled, the amount in any case depending<br />

entirely up<strong>on</strong> the volume of the substance. An excepti<strong>on</strong> is<br />

water, which c<strong>on</strong>tracts when heated from 0° C. (32° F.) to<br />

4° C. (39.2° F.).<br />

Solids, with a few excepti<strong>on</strong>s, expand in all directi<strong>on</strong>s when<br />

heated and c<strong>on</strong>tract when cooled. An excepti<strong>on</strong> is iodide of<br />

silver, which, within a certain temperature range, c<strong>on</strong>tracts<br />

when heated and expands when cooled.<br />

38.—Force of Expansi<strong>on</strong> and C<strong>on</strong>tracti<strong>on</strong>.—The force of

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