Explain why a brass lid on a glass jar will loosen when heated? The CTE for bras

Question

Explain why a brass lid on a glass jar will loosen when heated? The CTE for brass and glass is 20 times 10^-6 K^-1 and 9.0 times 10^-6 K^-1, respectively Suppose the lid is made of tungsten. What will be the effect of heating the lid and jar? Why? The CTE for tungsten and glass is 4.5 times 10^-6 K^-1 and 9.0 times 10^-6 K^-1, respectively. A 104.7 mm long Al_2 O_3 furnace tube is heated from room temperature (25 degree C) to 1,000 degree C. Assuming the tube is not mechanically constrained, calculate the increase in length produced by this heating. (alpha almostequalto 8.8 times 10^-6 degree C^-1) Consider the railway line from Sydney to Melbourne. If we approximate its length to 1,000 km, how much longer would it get if we assume that it is a single piece of steel and the whole line heats up from 20 degree C to 40 degree C. The CTE for steel is 12 times 10^-6 K^-1. From (iv), if this was a workplace design issue, what observation might you make to your manager or colleagues about the choice of temperatures in the calculation? Do you have an obligation to make this observation (discuss). Shrink fitting is a common method of attaching gears, cylinders liners etc. to another metal where mechanical fastening, welding etc. is not practical. see youtube.com/watch? V = US6rMtLR6nE

Explanation / Answer

Glass jar will expand due to less CTE comaprision to brass lid. So brass lid will loosen when heated.

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