3B Scientific Linear Expansion Apparatus with Three Pointers User Manual
Page 4
Elwe Didactic GmbH ▪ Steinfelsstr. 6 ▪ 08248 Klingenthal ▪ Germany ▪
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3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪
www.3bscientific.com
Subject to technical amendments.
• 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 continue till the
tubes have attained a temperature equal to
the boiling point of water (100°C). Observe the
respective pointer deflections
•
Read the thermal expansion l off the scale
(1 mm thermal expansion corresponds to 4 cm
pointer deflection on the scale).
•
Calculate the temperature difference T in
relation to the room temperature.
The coefficient of linear thermal expansion of
different materials can be determined by the for-
mula:
T
l
l
∆
⋅
∆
=
α
where l is the length of the tube measured from its
fixed bearing up to the pilot
bearing.