Metal lids on glass jars can often be loosened by running them under hot water. Why is this?

a. The hot water is a lubricant.
b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal.
c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass, thus loosening the connection.
d. This is just folklore.


C

Physics & Space Science

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