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If my
Why not use a hollow tube and run water through it? . The
temperature can be changed within seconds by turning on the other tap!
rough estimates are right, even with tap water at 140F = 60C andmm, which you can easily measure with your favorite technique.
68F=20C, a one meter tube would expand about (1 m)(0.000025/C)(40 C) = 1
Very good thought but-----