# For copper steel and aluminum tubing there is only a

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placement the length readings are found by. For copper, steel, and aluminum tubing there is only a required original length measurement because all these materials are isotropic. Setup for this lab: thermoplastic tubing banana plug patch chords water vapor collection cup steel tube thermal expansion apparatus steam generator Procedure : 1) Measure the original length of the tubing (copper, steel, or aluminum) from the inside of the angle bracket to the inside of the pin. 2) Place the tube with the angle bracket against the spring arm with the pin resting in the slot provided. 3) Attach the thermistor lug with the foam insulator over the lug. Place the leads from the ohmmeter to the banana plug connector labeled THERMISTOR. 4) Measure the resistance in ohms at room temperature, and then attach the thermoplastic tubing from the steam generator to the side at a higher elevation. 5) Before any expansion occurs “zero in” the dial gauge to enable accurate measurements of the tube’s expansion. 6) Turn the steam generator on providing that a collection cup is in place at the lower elevation to catch the excess water. After the resistance stabilizes record its measurement in ohms and then the expansion of the tube (given by the dial gauge noting 1 o = 0.01mm of tube expansion).

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7) Repeat the experiment for each different tubing material. Data : Table 1 L (mm) R rm (Ω) ΔL (mm) R hot (Ω) Copper 700.0 106.2 0.88 11.2 Steel 700.0 109.7 0.54 14.0 Aluminu m 700.0 109.2 1.16 16.8 Analysis : In order to convert our resistance measurements to temperature, the provided “Thermistor Conversion Table” is used. Then, the change in temperature is calculated using: For example: Table 2 R rm (Ω) T rm (*C) R hot (Ω) T hot (*C) ΔT (*C) Copper 106.2 23.5 11.2 79.0 55.5
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