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.
