Physics
When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Has high temperature coefficient of expansion
Is a bad conductor of heat so only inner surface expands
Has a very low specific heat
Has low temperature coefficient of expansion

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Physics
Absolute Zero is defined as

At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases
At which water boils at 298K

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