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water jacket
A water jacket is a water-filled casing surrounding a device, typically a metal sheath having intake and outlet vents to allow water to be pumped through and circulated. The flow of water to an external heating or cooling device allows precise temperature control of the device.
==Applications==
Water jackets are often used in watercooling. They are also used in laboratory glassware: Liebig, Graham, and Allihn condensers. Water jackets were used to cool the barrels of machine guns at the time of the First World War, but modern machine guns are air-cooled to conserve weight and hence increase portability.
In a reciprocating piston internal combustion engine the water jacket is a series of holes either cast or bored through the main engine block and connected by inlet and outlet valves to a radiator.
Equipment such as tissue culture incubators may be enclosed in a water jacket kept at a constant temperature.〔(CO2 Incubator: A Laboratory Staple ). Thermo Scientific, Nov 29, 2000.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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