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You can make a plastic bottle neutrally buoyant by adding just enough weight (like sand or rocks) to offset its natural buoyancy. This can be done by experimenting with different amounts of weight until the bottle neither sinks nor floats when placed in water.

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1y ago

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How to make something neutrally buoyant?

Figure out the weight of the device (ROV, submarine,etc), and then the weight of the water displaced. When they are equal, the device is neutrally buoyant. However, usually engineers create a ROV with a slightly positive or negative bouyancy, personally I perfer a positivly buoyant ROV because if you lose power or the tether is cut the ROV will ascend back up to the top. A more simple answer is that when the gravity & buoyancy are equal it is neutrally buoyant


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