Gas struts (also called gas springs) are pneumatic springs that use compressed gas to exert force. Their advantages over coil springs are that their force is practically independent of spring movement and they require very little space. Gas struts are used as parts in car bodies. For example, they assist with the opening and closing of trunk lids, hoods, and, in come cases, rear windows.
After years of use, the spring force diminishes due to microleakage of the pressurized gas strut, with the result that the lid or hood can no longer be held open. Standard automotive gas struts are not rechargeable and must be replaced.
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