cryophorus

cryophorus is a   Noun

Definition:

[1] An instrument used to illustrate the freezing of water by its own evaporation. The ordinary form consist of two glass bulbs, connected by a tube of the same material, and containing only a quantity of water and its vapor, devoid of air. The water is in one of the bulbs, and freezes when the other is cooled below 32º Fahr.

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