A text-book on chemistryFor the use of schools and colleges . oe-cific Heat wider Compression and Dilatation.—The-ory of the Formation of Clouds.—TJie Fire Syringe.— Cold of the Upper Regions of the Air.— Connec-tion between Specific Heats and Atomic Weights.—Latent Heat.—Melting Points of various Bodies.—Latent Heat of Water and other Bodies. The capacity of gases for heat is determined bywarming a known weight by means of a spiral tube im-mersed in hot oil, and then conducting the gas througha vessel surrounded by a known weight of water. Theinquiry is attended by very great difficulties. Wh
A text-book on chemistryFor the use of schools and colleges . oe-cific Heat wider Compression and Dilatation.—The-ory of the Formation of Clouds.—TJie Fire Syringe.— Cold of the Upper Regions of the Air.— Connec-tion between Specific Heats and Atomic Weights.—Latent Heat.—Melting Points of various Bodies.—Latent Heat of Water and other Bodies. The capacity of gases for heat is determined bywarming a known weight by means of a spiral tube im-mersed in hot oil, and then conducting the gas througha vessel surrounded by a known weight of water. Theinquiry is attended by very great difficulties. When the volume of a gas increases its capacity for What did Rumford conclude? What was Davys experiment?What conclusion did he come to ? How is the capacity of gases forheat determined ? VARIATIONS OF SPECIFIC HEAT. 37. heat increases, and a diminution of volume is attendedwith a diminution of capacity. If a Bre- p^. thermometer be placed under the re-ceiver of an air-pump, which is rapidly ex-hausted, Fig. 25, a sudden reduction of tem-perature is indicated. As the rarefactionproceeds the capacity for heat increases, anincrease which is satisfied at the expense of aportion of the sensible heat. On the same principle, the appearance of the fog orcloud, which comes when moist air is rarefied, is ex-plained. The quantity of vapor that can exist in a giv-en space depends on the temperature. If the space iscooled, a portion of the vapor will condense. When,by suddenly rarefying air, we increase its capacity forheat, the temperature falls, and part of its moist- 2^. assumes the form of drops. If a bell-jar istaken, the inside having been rinsed out withwater and placed on the air-pump stand, on ex-hausting, a mist makes its appearance, whichimmediately clears up on readmitting the air,A cand
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