A helium balloon floats because it is less dense than the air around it. In a previous experiment about density, we learned less dense objects float, denser things sink. (Photo Credit: Ray Petelin) ...

ALBUQUERQUE, N.M. — Two pilots in a helium-filled balloon landed safely off the coast of Mexico on Saturday after a nearly 7,000-mile long trip across the Pacific Ocean. The pilots landed off ...

Student helium balloon project snaps Sask. class photo from edge of space Teacher James Stone says his grade six students’ “jaws hit the desk” when they saw their own faces staring back at ...

Current law allows the release of up to 10 helium-filled balloons in a 24-hour period. But critics say that the law is not widely known and not enforced.

So a helium balloon has two opposing forces acting on it: gravity pulling it down, and buoyancy pushing it up. Buoyancy wins, so you can’t really weigh a balloon, even though it does have weight.

A helium balloon on the moon might as well be made of lead. For any balloon to stay aloft in any atmosphere, the gas inside it must be lighter than the surrounding air.

That is not the case. As you accelerate forward, the helium balloon will be thrown forwards too. It's a strange sight, especially when compared to a balloon filled with typical air rather than helium.