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# Thermal effects: Expansion and Refrigeration

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3. Pyrex glassware is noted for its ability to withstand sudden temperature changes without breaking. Explain how its coefficient of linear expansion contributes to this ability.

4. The door of a refrigerator is left open. Assuming the refrigerator is in a closed room, will the air in the room eventually be cooled? Explain why or why not.

##### Solution Summary

This solution helps with heat and thermodynamics problems. The problems involve coefficients of linear expansion and cooling temperatures.

##### Solution Preview

Pyrex glassware is noted for its ability to withstand sudden temperature changes without breaking. Explain how its coefficient of linear expansion contributes to this ability.

The glassware breaks up on pouring boiling water because the portion of glass in contact with boiling becomes hot and expands while the outer surface is in contact with air and does not expand. The difference in the volume of inner portion creates shear and if the stress is more than the shearing strength of glass it will break out.

Thus to avoid breaking up ...

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