A volatile liquid hydrocarbon that was historically used as a refrigerant and in early cooling machines.
From Greek kyma (wave) + -gene (producing), coined in the 19th century because this chemical could be used to produce cold waves of temperature. The word reflects the chemical's property of creating rapid temperature changes.
Cymogene was literally ice in a bottle—Victorian engineers used it to create artificial cold before electric refrigerators existed, and it represented one of humanity's first successful attempts to manufacture winter on demand!
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