3b-scientific Linear Expansion Apparatus with Three Pointers Manual de usuario descargar pdf (Pagina 2)

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Subject to technical amendments.

4. Technical data

Dimensions: 830 x 80 x 70 mm

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

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:

⋅

=α

where l is the length of the tube measured from

its fixed bearing up to the pilot

bearing.

Fig. 1 Experimental set-up

1 2

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