Chemical Primer An Elementary Work for Use in High Schools Academies And Med
Chemical Primer An Elementary Work for Use in High Schools Academies And Med
S P Simeon Pease Meads
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(See CHEMISTRY OF CLEANING. ) " Evaporation cools. " This means that when a substance evapo- rates it absorbs heat from what is near by. (See sulphur dioxide, AP- PENDIX. ) Wet one hand and pass both hands rapidly through the air. The wet hand is sensibly colder from the evaporation of the water. Pour a little ether upon the thermometer bulb. The ether quickly evaporates and the mercury falls. A pressure of about 4| atmospheres (at 0) converts gaseous into liquid ammonia. The evaporation of liq...uid ammonia produces intense cold ( 40). Advantage is taken in the arts of this fact to produce ice artificially. In a strong generator, A, is placed ice water saturated with ammonia gas (1, 000 vols. In one). This is con- nected with an equally strong receiver D, by the tube B. Receiver D is placed in cold water. Heat is applied to A and the great pressure of escaping gas converts the gas into a liquid in D. Water is now placed in vessel C. Generator A is cooled and the liquid ammonia in D evaporates and is reabsorbed by water in A.
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