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 ...

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 ...

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.

Horizontal convection describes fluid motion driven by differential heating along a horizontal boundary, whereby variations in buoyancy generate circulation. Recent theoretical, computational and ...

Pretty much everyone loves balloons—especially younger children. Kids are slowly building up ideas about the way the universe works (through their observations), and they already know that when you ...

Going bottom-up is no problem for a boat on the underside of a levitated liquid. In a container, liquid can be levitated over a layer of gas by shaking the container up and down because the repeated, ...

Students prepare a diving tank and a submarine and make the submarine neutrally buoyant in the tank. Submarines are important to military operations and to undersea exploration because they can ...