. Elementary physics and chemistry: second stage. Science. 68 ELEMENTARY PHYSICS AND CHEMISTRY. instead of iron tacks. Compare, as before, the heating effect of the copper with that of the same mass of water. Heat capacities of various stcbstatices.—Repeat the preceding experiments, using, instead of the tacks and the copper, loo grams of lead shot ; also loo grams of glass beads, mercury, sand, or any other substances Fig. 40.—The quantity of water in A is greater than that in B, though the level is the same. A' and B' have equal capacities for water, but the levels produced when
. Elementary physics and chemistry: second stage. Science. 68 ELEMENTARY PHYSICS AND CHEMISTRY. instead of iron tacks. Compare, as before, the heating effect of the copper with that of the same mass of water. Heat capacities of various stcbstatices.—Repeat the preceding experiments, using, instead of the tacks and the copper, loo grams of lead shot ; also loo grams of glass beads, mercury, sand, or any other substances Fig. 40.—The quantity of water in A is greater than that in B, though the level is the same. A' and B' have equal capacities for water, but the levels produced when the water from A and B respec- tively are poured in them are different. Arrange the substances in a table, from that substance that gives up most heat to that which gives up the least. REASONS AND RESULTS. Comparison of capacities of bodies for heat and capacities of vessels for water.—Just as all vessels have not the same capacities, or storing powers, for water, so equal quantities of different substances have not the same capacities for heat or heat-storing powers. The same amount of water does not raise the level of the water in vessels of different capacities to the same amount ; nor does the same amount of heat raise the tem- peratures of equal masses of bodies Iraving different capacities for heat through the same number of degrees of temperature. Again, if the levels of water in two vessels—one wide and the other narrow—be the same, and the water they contain is transferred into two equal vessels, the levels of the water in the second pair of vessels is by no means the same. The level is higher in that vessel which contains the water from the wider vessel (Fig. 40). Similarly, suppose equal masses of lead and water are heated to the same high temperature, say 100" C, and the lead is put into one mass of water at a lowev temperature, say 20° C, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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