# Buoyancy Compensators

When underwater, a diver often needs to be neutrally buoyant so that the diver neither sinks nor rises but remains at constant depth, with minimal effort. A state of neutral buoyancy exists when the weight of water that the diver displaces equals the total weight of the diver. The diver uses the BCD to maintain this neutral buoyancy by adjusting the BCD’s volume and therefore its buoyancy, in response to various effects, which alter the diver’s overall volume or weight.

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