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One Pound of Sand  You've added one pound of sand. The sub, which displaces two pounds of water when submerged, now weighs two pounds. Since the weight of the water displaced by the sub equals the sub's weight, the sub is, in a sense, weightless in the water. It drifts between the surface and the bottom. Try Again Stories in the Timber | Explore the Shipwreck | Who Owns Lost Ships? Buoyancy Brainteasers | Teacher's Guide | Resources | Transcript | Site Map Voyage of Doom Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |