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Old 04-20-2013
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Re: 100 lb of Lead Vs 100 lb of concrete

Quote:
Originally Posted by benesailor View Post
I was in the marina yesterday and heard something from the staff that had me perplexed.
He said that under water lead weighs more than concrete if they are of the same weight.

Now; after some checking it appears he may be right. As a ball of lead would have less "displacement" than a similar weight of concrete that would be much larger size. Does the amount of surface area on a sunken mass play a factor in its level of buoyancy?

Is this correct?
Not the amount of surface area (that plays no role), but volume. Volume plays a role here. More volume = more displacement.
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