fbk
Contributor
+1 on just hiring a tank, or getting to use a nearly empty one for free. You should do your weight check at safety stop depth anyway. Doing it on the surface in a pool with no tank or no regs... is guesswork at best.
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Your body is mostly water so the average build has little effect on buoyancy. The weight of a full tank, more specifically, the gas it contains is compensated by inflating the BCD and as the gas is used the air in the BCD is eliminated. This is part of a balanced rig.
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Your body is mostly water so the average build has little effect on buoyancy.