OBJECT: To measure the heat of fusion of ice, using the method of mixtures.
METHOD: A piece of ice of known mass is dropped into a calorimeter containing a measured quantity of water. The heat given up by the calorimeter cup and its contents (water, thermometer and stirrer) is computed from their combined thermal capacity and the change in temperature. The heat absorbed by the ice is expressed in terms of the mass of ice, the heat of fusion and the change in temperature of the water from the melted ice. The heat given up by the cup and its contents is set equal to the heat absorbed by the ice, and this equation is solved for the latent heat of fusion. A correction is made for the exchange of heat between the calorimeter cup and its surroundings.
Continue reading ‘Heat of Fusion’
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OBJECT: To investigate the relationship between the pressure and temperature of a constant volume of gas.
METHOD: A mass of dry air is trapped above a column of mercury in a closed tube immersed in water. The closed tube forms one arm of a mercury manometer. The pressure upon the confined air, and hence its volume, can be regulated by means of a plunger in a mercury reservoir. The value of the pressure is obtained from the difference between the mercury levels in the open and closed arms of the manometer. The temperature of the water bath is altered and a series of observations is made upon the pressure of the confined gas, its volume being maintained constant.
Continue reading ‘Expansion of Gases’
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