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My physics laboratory was about thermal expansion of metals. Aluminium and copper tubes were the metals...

My physics laboratory was about thermal expansion of metals. Aluminium and copper tubes were the metals that I used for the experiment. In this lab I observed how different metals expand in different temperatures. To find the coefficient of expansion I had to place a long rod of copper in an enclosed tube. I then heated the tube using steam from boiling water. I observed the change in temperature and measured the change in length. What are some sources of error? Human errors, calculation errors and measurement errors DO NOT COUNT.

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