Constant Volume Gas Thermometer

Diagram of apparatus :

Experiment :

Mount the thermometer on the retort stand.
Place the bulb in a beaker of water and measure the temperature.
Heat the water in the beaker using the bunsen burner.

Physics involved :

This experiment demonstrates the relationship between P and T (from PV = nRT) by removing the change in volume of the gas.

The air in the bulb expands (or contracts) when heated (or cooled) and moves the mercury level. The new level is proportional to the difference in temperature.

Questions :

How could you measure the pressure without changing the volume of the working medium. Explain.

Return to Temperature, slide 8

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