Ah, the stately hot air balloon. Not really useful for all that much except for having a grand old time floating around the skies, it's still a marvel of simple physics. Fill a giant balloon with air.

make an object neutrally buoyant in water. understand buoyancy forces. Submarines are important to military operations and to undersea exploration because they can function entirely underwater.

Here is another one of those great questions that promotes epic "office discussions". (this one sent in by Russ) "An Olympic-sized swimming pool is filled with 660,000 US gallons of water. An ...

NORFOLK, Va. — Spongebob, Mickey Mouse and of course Snoopy. They're all staples of the Macy's Thanksgiving Day Parade! This annual tradition mixes art, music, and science for millions of viewers.

A hollow plastic sphere is held below the surface of a fresh water lake by a cable anchored to the bottom of the lake. The sphere has a volume of 0.300 cubic meter, and the tension on the cable is 900 ...

Schematic illustration of the (a) upward buoyancy force on a rising air parcel expected from its lower density (neglecting air motions), if it rises without mixing (blue line), with mixing in a 100% ...

I haven't seen the Pixar Movie "Up" yet, so don't spoil it for me. I have, however, seen the trailer. In my usual fashion, I have to find something to complain about. There is this scene where the old ...