3B Scientific Thermal Expansion Apparatus D - Manual (Page 4)

4
pansion for a certain temperature rise
∆T. Thus the
tubes are heated to 100° C by means of steam and the
temperature difference
∆T from room temperature is
calculated. The expansion is determined from the
movement of the pointer, where a pointer movement
of 50 mm indicates an expansion of 1 mm. The expan-
sion coefficient is determined from the length of the
tube
∆l between the two fixed points by means of the
formula:
α =
⋅
∆
∆
l
l T
4. Instructions for use
• Attach the fixed mount at marking 200, 400 or 600.
• Attach the open end of the tube to be tested into
the fixed mount and secure it with the screw. The
screw should grip the ring nut of the tube.
• Hoses should be attached as in Figure 1 and the
run-off bowl should be placed under the hose.
• Adjust the point to zero if necessary.
Also required for heating the tube under test:
Vapor generator or a bunsen burner heating an Erlen-
meyer flask
5. Storage
The glass tube should be secured beneath the base strip
to avoid damage.
Figure 2
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