Laboratory exercises to accompany Carhart and Chute's First principles of physics . are 0°C. and 100° C, respectively, as these tempera-tures are easy to obtain with ice and steam. The gas isconfined in a Charles law tube by means of a mercury 198 LABORATORY EXERCISES plug, which is free to move as the volume of the gaschanges. The relation between volume and temperature underconstant pressure is most conveniently expressed withreference to the absolute scale of temperature. On thisscale the zero corresponds to — 273° C. The Centigradezero is equivalent to 273° A. To change Centigradetemperatu
Laboratory exercises to accompany Carhart and Chute's First principles of physics . are 0°C. and 100° C, respectively, as these tempera-tures are easy to obtain with ice and steam. The gas isconfined in a Charles law tube by means of a mercury 198 LABORATORY EXERCISES plug, which is free to move as the volume of the gaschanges. The relation between volume and temperature underconstant pressure is most conveniently expressed withreference to the absolute scale of temperature. On thisscale the zero corresponds to — 273° C. The Centigradezero is equivalent to 273° A. To change Centigradetemperatures to absolute temperatures, add 273° algebrai-cally. Experimental: With the steam boiler half full of water, light theburner underneath, and screw on the chimney. Thelower outlet for the escape of steam should be closed by a screw compressoron a rubber waiting forthe water to boil,determine the vol-ume of inclosed airat 0° C. as directedin (a). (a) The mer-cury index in theCharles law tubeshould stand atabout the center ofthe graduated the tube,. Fig. 72. with its scale, in a jar containing finely cracked ice,or snow, so that the mercury index is a short distanceabove the surface of the ice. Note the descent of theindex as the inclosed air contracts. When no furthercontraction occurs and the inclosed air is all surrounded INCREASE IN VOLUME AT CONSTANT PRESSURE 199 by melting ice (Fig. 72, B), take the reading of the indexon the graduated scale. Since the tube is of uniformdiameter, the length of the inclosed column of air may betaken as the measure of its volume. Record the readingin a tabular form near the top of the left-hand page. (b) Remove the air tube from the ice, and allow it tostand five minutes or so in the air to regain the roomtemperature. Then slowly slip the tube with its scalethrough the cardboard cover on top of the chimney of theboiler. The mercury index should be just visible abovethe cardboard (Fig. 72, 0). When the column o
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
