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It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.

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Does extreme cold make **everything** extremely brittle?

This transition is temperature dependent (amongst others (strain-rate ...)). Can every composition actually reach low enough temperatures, or do some have a transition temperature below 0K. … As these mechanisms are very basic and general, I think that any material should undergo such a transition (assuming transition temperature above 0K). …
Knut Gjerden's user avatar