# Ch17 - Chapter 17 Thermal Properties Concept Check 17.1 Question(a Explain why a brass lid ring on a glass canning jar will loosen when heated(b

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Chapter 17 Thermal Properties Concept Check 17.1 Question: (a) Explain why a brass lid ring on a glass canning jar will loosen when heated. (b) Suppose the ring is made of tungsten instead of brass. What will be the effect of heating the lid and jar? Why? Answer: (a) A brass lid on a glass canning jar will loosen when heated because brass has the greater coefficient of thermal expansion [20 x 10 -6 ( ° C) -1 versus approximately 9 x 10 -6 ( ° C) -1 for glass, Table 17.1]. (b) If the ring is made of tungsten instead of brass, the ring will tighten upon heating inasmuch as the glass will expand more than tungsten. The values of α l for glass and tungsten are 9 x 10 -6 ( ° C) -1 and 4.5 x 10 -6 ( ° C) -1 , respectively.

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Concept Check 17.2 Question: The thermal conductivity of a plain carbon steel is greater than for a stainless steel. Why is this so? Hint: you may want to consult Section 13.2. Answer:
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## This note was uploaded on 05/19/2008 for the course MS 4032 taught by Professor Anony during the Spring '08 term at A.T. Still University.

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Ch17 - Chapter 17 Thermal Properties Concept Check 17.1 Question(a Explain why a brass lid ring on a glass canning jar will loosen when heated(b

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