Cold finger

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Cold finger, a piece of laboratory equipment that is used to generate a localized cold surface, and is name for it resemblance to a finger.

Typically a cold finger is used in a sublimation apparatus, or can be used as compact version of a condenser in either reflux reaction or distillation apparatus.

The device usually consists of a chamber in which a liquid (typically cold tap water) can enter an leave. Another version involves filling the device with a cold solid such as ice, or dry ice.