It makes sense that a balloon filled with a lightweight gas such as helium would float when surrounded by heavier air. But why does filling a huge balloon with hot air also make it float? This ...

PITTSBURGH (KDKA) -- Have you ever had a helium balloon in your car and notice that its movements are much different than you would expect? If you never noticed, it is certainly something to see. It ...

When most people think of helium, they think of balloons, which float as a result of the low density of the inert gas. However, helium has many uses beyond birthday party decorations. Helium plays a ...