Lec14 - Today Finish Chapter 15(Temperature Heat and...

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Today: Finish Chapter 15 (Temperature, Heat and Expansion) A few discussion/revision questions on last few chapters…
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If you stake out a plot of land with a steel tape on a very hot day, the actual amount of land you will have will be A) smaller than measured. B) larger than measured. C) correct. Answer: B Due to the thermal expansion of the steel, the tic marks on it would be more widely spaced than usual. So a measurement of say 10cm on the expanded tape would represent a larger distance than 10cm.
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If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature A) increases. B) decreases. C) neither of these Answer: B If the dominant expansion is that of the glass, then for mercury to rise in it, the glass would be contracting (so it squeezes the mercury upwards), i.e. the temperature would be decreasing.
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Can a sample of water possibly have the same volume after being warmed by several Celsius degrees?
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