cryophorus


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cryophorus

(kraɪˈɒfərəs)
n
(General Physics) a glass tube with a bulb at each end which contains water and water vapour, used in physics to demonstrate freezing by evaporation
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Wollaston used the cryophorus to show how cold could be transmitted: by immersing one bulb of the pulse glass in ice water, the water in the other bulb--at a distance of three feet or more could be frozen.
Through the 1800s the cryophorus was commonly used to demonstrate the effect of pressure on evaporation, and simultaneously the heat loss suffered in evaporation (Comstock [1845], p.