The process of measuring extremely low temperatures or the technique and methods used in measuring cold.
From Greek 'kryos' (cold) and 'metria' (measurement). Parallel to 'pyrometry' (measuring heat), this field developed alongside cryogenic research in laboratories.
Cryometry became critical in the 1900s when scientists realized that at extremely low temperatures, materials behave completely differently—metals become brittle, gases liquefy, and magnetism changes!
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