012-08375A
Small Piston Heat Engine
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Experiment 1: Operation of a Heat Engine
➀
Using the one-holed stopper, connect the tubing
with the one-way valves to the air chamber and
to a connecting port on the base assembly.
➁
Close the shut-off valve on the tubing from the
unused port.
➂
Set a mass of 50 to 100 g on the mass platform.
➀
Move the air chamber from an ice water bath to a
hot water bath. You will note that the air in the
chamber quickly expands through the tubing and
moves the piston up. Note also that the one-way
check valve in the tubing connecting the base
apparatus and the air chamber permits air to enter
the cylinder, while the other one-way checkvalve
prevents air from leaving through the branched
tube.
Equipment Setup
➤
Note:
Use a maximum mass of 100 grams in
the experiment. A larger mass will cause the
valve seals to leak.
Procedure
Figure 1.1. Setup for the Heat Engine
Close the shut-off
valve on the
tubing from the
unused port.
direction of
air flow
one-way check
valves
➁
Move the air chamber back to the cold bath and note that external air is sucked into the air chamber through the
one-way valve located at the end of the branched tube. Note also that the one-way valve in the connecting
tube prevents the air from escaping from the piston, so the height of the piston remains the same.
➂
Repeat steps 1 and 2 until the mass has been completely lifted. The greater the temperature differential be-
tween the hot and cold water baths, the greater the lift achieved through each cycle through them.
Equipment Required:
• Small Piston Heat Engine
• Mass, 50 – 100 g mass
• Container of hot water
• Container of ice water
mass
air chamber
Note:
For a more detailed, quantitative investiagtion of the heat engine operation, see Experiment 5 (page 11).
