. Elementary physics and chemistry: second stage. Science. RELATIVE CAPACITIES FOR HEAT. 67 into the beaker an equal. Observe the temperature. Pour quantity of hot water, at a tem- perature of about 70° C. Observe the temperature of the mixture. Weigh out the same quantity of cold water as before, and observe its temperature. Put into a test- tube an equal mass of iron tacks. Stand the test-tube, with the ther- mometer surrounded by the tacks, in a beaker of water, and boil the water. A loose plug of cotton- wool may be used to keep the tacks dry (Fig. 39). Observe the temperature of the tack
. Elementary physics and chemistry: second stage. Science. RELATIVE CAPACITIES FOR HEAT. 67 into the beaker an equal. Observe the temperature. Pour quantity of hot water, at a tem- perature of about 70° C. Observe the temperature of the mixture. Weigh out the same quantity of cold water as before, and observe its temperature. Put into a test- tube an equal mass of iron tacks. Stand the test-tube, with the ther- mometer surrounded by the tacks, in a beaker of water, and boil the water. A loose plug of cotton- wool may be used to keep the tacks dry (Fig. 39). Observe the temperature of the tacks, and when the water has been steadily boiling for some time take out the thermometer, cool it under a tap, and dry it. Take hold of the test- F'f ⢠39--A method of heating a â '. substance to the temperature of tube with a duster, quickly pour boiling water. the tacks into the cold water, and observ-e the temperature of the mixture. Record your observations thus : f Mass of water, ----- gms. Temperature of water, - - - °C. Gain-, â mixture, - - - °C. Number of degrees through which the \ temperature of the water was raised, ° C. r Mass of iron tacks, - - - - gms. Loss J '^^"^P^''^^"''^ " â " " ' ° ^⢠I Number of degrees through which the 1^ temperature of the tacks fell, - - °C. Compare the effect of the tacks in raising the temperature of the cold water with that of the same mass of hot water at the same temperature : 100 gms. of water at ° C. raised the temperature of 100 gms. of water at °C. through ° C. 100 gms. of tacks at ° C. raised the temperature of 100 gms. of water at ° C. through ° C. J7eaf capacity of copper.âCut 100 grams of thin copper wire into pieces, and repeat the preceding experiment with them. 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 rese
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