Quote:
Originally Posted by Rattlesnake Guy
Is a dive tank weighted? Or are the tank walls just that heavy> I was surprised to hear you say it sank.
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The weight of air compressed into a dive tank is not negligible. As noted in this reference:
http://en.wikipedia.org/wiki/Diving_cylinder
as a tank goes from full to empty, the tank goes from negative to positive buoyancy. See "Weight of Gas Consumed," a table about 2/3 the way down that piece.