Water jacket
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A water jacket is a water-filled void surrounding a device, typically a metal sheath having intake and outlet vents to allow water to be pumped through the void. The flow of water to an external heating or cooling device allows precise temperature control of the device.
[edit] Applications
Water jackets are often used in watercooling. They are also used in laboratory glassware - Liebig, Graham and Allihn condensers. In the pasts, water jackets were used to cool the barrels of machine guns such as the Browning M1917. Nowadays, barrels of machine guns are air-cooled to reduce weight and complexity. A radiator used to dissipate heat in an internal combustion engine is an implementation of a water jacket as well. Water jackets are commonly used around a nuclear power core to contain radiation.
