3B Scientific Linear Expansion Apparatus with Three Pointers - Manual (Page 2)

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Subject to technical amendments.
© Copyright 2013 3B Scientific GmbH
4. Technical data
Dimensions: 830 x 80 x 70 mm 3
Weight: 1200 g approx.
Sample tubes: Brass, aluminium, glass
Dimensions: 700 mm x 6 mm Ø
Tube length: 600 mm
5. Operation
In order to perform the experiment, the following
equipment is additionally required:
1 Steam generator (230 V, 50/60 Hz) 1001049
or
1 Steam generator (115 V, 50/60 Hz) 1006769
• Mount the mirror scale onto the base strip.
• Clamp the pointers below the tubes so as to
facilitate the measurement of thermal ex-
pansion.
• Calibrate all pointers to zero.
• Fill half of the steam generator with water,
place it onto the hot plate, insert the cork
cover and fasten it shut with the securing
clamp.
• Connect the thermal expansion apparatus to
the steam generator with a hose.
• Place a dish below the sample tube ends in
order to collect condensed water.
• Measure the room temperature T.
• Switch on the hot plate.
• Allow the steam to flow for some time
through the sample tubes. This should con-
tinue till the tubes have attained a tempera-
ture equal to the boiling point of water
(100°C). Observe the respective pointer de-
flections
• Read the thermal expansion Δl off the scale
(0.1 mm thermal expansion corresponds to
4 cm pointer deflection on the scale).
• Calculate the temperature difference ΔT in
relation to the room temperature.
The coefficient of linear thermal expansion α of
different materials can be determined by the
formula:
T l
l
Δ ⋅
Δ
= α
where l is the length of the tube measured from
its fixed bearing up to the pilot
bearing.
Fig. 1 Experimental set-up