This experiment uses a constant volume thermometer to measure the pressure change with temperature. When a graph of P vs T is plotted the approximate value of absolute zero can be determined from the data. The Constant Volume Thermometer consists of a sealed steel sphere filled with helium. The pressure of the thermometer is measured first at room temperature, then in boiling water, ice water if desired and finally in liquid nitrogen.

Equipment
Dewar		Constant Volume Thermometer		Thermometer
Bunson Burner		Bucket		Water
LN2		Overhead Graph