PASCO TD-8513 Heat Conduction Apparatus - Manual (Page 15)

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M o d e l N o . T D - 8 5 1 3 S a m p le D a t a
15
C. Heat Waves
In this graph the far thermistor lags the near
thermistor by 11.1 s. The wave speed is
30 mm/11.1 s = 2.7 mm/s.
The wavelength is 140 mm, about twice the
length of the bar.
Experiment #2: Angstrom’s Method
A. Aluminum
B. Brass
Wide brass bar:
Period (s) A
c
A
f
∆ t k (W/m·K) Average k (W/m·K)
30
0.671 0.206 5.38 165
172 0.673 0.214 5.22 174
0.673 0.219 5.28 176
40
0.912 0.341 6.21 171
166 0.909 0.339 6.28 169
0.903 0.330 6.51 159
50
1.09 0.449 7.5 157
160 1.09 0.441 7.6 152
1.12 0.471 7.05 171
Average 165
Period (s) A
c
A
f
∆ t k (W/m·K) Average k (W/m·K)
50
0.430 0.110 10.2 106
107
0.452 0.121 9.7 115
0.426 0.108 11.1 97
0.429 0.118 11.1 103
0.440 0.123 10.3 112