Purpose: To demonstrate the relationship between temperature and pressure in a gas.

Beaker with ice, Pressure gauge with metal ball filled with gas on end.

Your students can find the relationship between temperature and pressure for a variety of gases using this apparatus. Simply designed and sturdily made, it has a metal bulb to hold gas and a Bourdon gauge to indicate pressure. There is a valve near the gauge for letting gas in and out. Just fill the apparatus with gas, then heat or chill the bulb to different temperatures. The gauge will indicate the pressure at a given temperature. Students can graph the results to understand this important relationship and estimate the absolute zero temperature. Apparatus is 55cm long, bulb is 10cm in diameter.

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