. Elementary physics and chemistry: second stage. Science. CONVERSION OF WATER INTO STEAM. S5. Fig. 46.—A simple arrangement for pro- ducing steam and determining the quantity of heat given out by steam when it becomes water. passes a short glass tube bent at a right angle. About half an inch from the open end inside the test-tube a hole is blown in the side of the glass tube (Fig. 46). Boil water in the test-tube, and, when steam is issuing freely, place a weighed calorimeter con- taining water, the mass and temperature of which have been observed, so that the end of the tube from which steam
. Elementary physics and chemistry: second stage. Science. CONVERSION OF WATER INTO STEAM. S5. Fig. 46.—A simple arrangement for pro- ducing steam and determining the quantity of heat given out by steam when it becomes water. passes a short glass tube bent at a right angle. About half an inch from the open end inside the test-tube a hole is blown in the side of the glass tube (Fig. 46). Boil water in the test-tube, and, when steam is issuing freely, place a weighed calorimeter con- taining water, the mass and temperature of which have been observed, so that the end of the tube from which steam is issuing is immersed in the water. The calori- meter may be wrapped in cotton wool and placed in an outer vessel if desired and the flame screened by a note-book. After the temperature has risen to about 40° C. remove the calorimeter—do not remove the test-tube from the flame—and observe the temperature. Then weigh the calori- meter and water again to find the mass of steam condensed. The observations may be written down thus : Mass of water, ----- Temperature of water at beginning, - ,, „ end, - Rise of temperature,- Mass of water -f mass of condensed steam, gms. Therefore mass of condensed steam, - gms. As in the last lesson, the changes of temperature can be arranged under two heads : Gain. Loss. The temperature of gms grns. of steam were con- • gms. .° C. .° C. .° C. of water was raised through ° C. The quantity of heat used = mass of water x rise of temperature. = calories. densed to water at 100° C. The temperature of gms. of water at 100° C. fell to ° C, that is, through °C. The cjuantity of heat thus given up = mass of con- densed steam (water) x fall of temperature. = Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gregory, R. A; Simmons, A. T. London: MacMillan
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