The device consists of a metal tube with a bulb at one end, and a Bourdon-tube pressure gauge at the other. An air valve lets you add gas to the tube under pressure. Heat or cool the bulb to different temperatures by immersing the bulb in hot water, cold water and a dry ice and alcohol mixture and read the resulting pressures directly off the gauge. Graph the results to track the temperature- pressure relationship and extrapolate these measurements at zero pressure.

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