A Charles' law lab demonstrates the relationship between the temperature and volume of a gas. The demonstration of the law requires the use of an Erlenmeyer flask, rubber stopper, 30-milliliter syringe and a thermometer.
First, the flask is cooled to 32 F in an ice-water bath. Next, the empty syringe and thermometer are inserted through the stopper, and the stopper is used to plug the mouth of the flask. The flask is then moved to a warm water bath. The air in the flask expands as it gets warmer and pushes the plunger of the syringe upward. Finally, data are recorded on the air temperature in the flask and the total volume of warm air in the flask and syringe. These data are then plotted on a graph that compares the temperature and the volume of the hot air.