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

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HEAT AND THERMAL EXPANSION 71<br />

such dissipati<strong>on</strong> of energy is the c<strong>on</strong>versi<strong>on</strong> of mechanical<br />

energy into heat. A familiar example of the generati<strong>on</strong> of<br />

heat by the dissipati<strong>on</strong> of energy is the stamping of <strong>on</strong>e's feet<br />

in cold weather to make them warm. Another example of<br />

the dissipati<strong>on</strong> of energy is furnished by the change in po-<br />

tential energy resulting from the drop in temperature of<br />

superheated steam caused by the radiati<strong>on</strong> or loss of heat<br />

from uninsulated boiler surfaces or steam pipe lines.<br />

34.—Effects of Heat.—The heating of a substance, by the<br />

dissipati<strong>on</strong> of energy, by c<strong>on</strong>tact with a hot body, or by any<br />

other means, may produce these effects:<br />

(a) Rise in temperature.<br />

(b) Meltage or vaporizati<strong>on</strong>.<br />

(c) C<strong>on</strong>tracti<strong>on</strong> or expansi<strong>on</strong>.<br />

(d) Dissociati<strong>on</strong>, if a chemical compound.<br />

(e) Exhibiti<strong>on</strong> of electrical phenomena.<br />

35.—Thermometers.—The most c<strong>on</strong>venient instrument to<br />

measure temperature, rise and fall, is a mercury thermometer,<br />

A P B

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