Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 159
ubstances are com-pressed they become better conductors. Light, freshly fallen snow encloses within it large quantities of air,and consequently forms a warm blanket for the earth, protecting theroots of plants from intense frost. Heat is conducted with the greatest difiiculty through a vacuum.The… … iiiiiiiiiiiiiiiiiiiiiiiiiif Fig. 161.—Illustrationof the non-conduc-tivity of water. cold for a long time. 152 TRANSFERENCE OF HEAT
Physics
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