Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 40
re-sent moment with compressed air. It has lain here for somehours, so that the temperature of the air within the vesselis now the same as that of the air of the room. At thepresent moment this inner air is pressing against the sidesof the vessel, and if this cock c be opened, a portion ofthe air… … this latter accomplishes the work of urging forward thestream of air. And what will be the condition of theworking air during this process ? It will be chilled.In fact, the only agent it can call upon to perform thework is the heat to which its elastic force is due. Aportion of this heat will be…
Heat
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