4E30.10 Constant Volume Gas Thermometer
Ideal gas law, absolute zero
Measurements of pressure at different temperatures with a fixed volume can be graphed to demonstrate the ideal gas law and absolute zero.
-  Gas thermometer
-  Lab stand
-  90-degree clamp
-  3-finger clamp
-  2000 mL beaker
-  Dewar
-  Mercury thermometer (-20 to 110 C)
-  Alcohol thermometer (-100 to 50 C)
-  Thermocouple
-  Hot plate or kettle
-  Ice scoop
-  Bucket of water
- Water ice
- Dry ice
- Liquid nitrogen
-  Safety goggles
-  Safety glove
- Put the ethanol in a dewar and pre-cool it with dry ice.
- Put the liquid nitrogen in the other dewar.
- Put water and ice in a beaker.
- Put water in the other beaker. Heat the water on the hot plate, if desired, or use the kettle.
- Mount the gas thermometer on the lab stand using the 90-degree clamp and 3-finger clamp.
- Be careful when putting anything into a dewar. The inside of the dewar is made of fragile glass.
- Liquid nitrogen, dry ice, dry ice in ethanol, and hot water can cause severe burns and blindness. Use with caution.
- Watch the hot plate or kettle to make sure the water doesn't boil out of control.
- Put on your safety goggles and gloves.
- Read the room temperature from a thermometer and the pressure in the gas thermometer.
- Repeat step 2 with the gas thermometer immersed in the various media: liquid nitrogen, dry ice in ethanol, ice in water, and hot water. For the liquid nitrogen, use a thermocouple to measure temperature.
- Plot P vs. T and extrapolate it to absolute zero at P = 0.
- PIRA 4E30.10
- DHP Ha-4; Meiners 25-2.7; Disc 16-02
- Don't attempt this at home!
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.