Lecture Demonstration Laboratory LDL Home» Thermodynamics» Change of State» Vapor Pressure
4C33.31
 
 

Pressure Cooker



Fill the pressure cooker half full of water. (Remove the pipe plug in the top to do this, and then replace it.) Place the cooker and the beaker of water on the hot plate. Raise the lever of the pressure valve to the UP position and remove the ball from the valve with the small magnet. Insert the thermocouple junction that comes out of the top of the pressure cooker into the beaker of water. Connect the ends of the thermocouple to the shunt (set at low sensitivity) and the galvanometer to the shunt. Turn on the hot plate burners and bring the water in the beaker and the pressure cooker to a boil. When they are both boiling, turn up the sensitivity to show that both junctions are at the same temperature. Then place the ball back in the pressure cooker valve and lower the lever to rest on the ball. The pressure will go up and the temperature will rise rapidly. Be ready to switch the shunt to a less sensitive range to protect the galvanometer.


Apparatus

Pressure Cooker with Thermocouple
Beaker of Water
2 Burner Hot Plate
Light Beam Galvanometer
Galvanometer Shunt
Laser
Small Magnet

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