A gas balloon is a type of balloon that relies on a lighter-than-air gas, such as helium, to rise into the atmosphere. There are several synonyms for this type of balloon, including hydrogen balloon, hot air balloon, and blimp. A hydrogen balloon uses the gas hydrogen to lift it into the air, while a hot air balloon uses heated air to rise. A blimp is a type of non-rigid airship that is often used for advertising purposes. Regardless of the type of gas balloon, they all share the unique ability to rise effortlessly into the sky, providing a thrilling experience for both pilots and passengers alike.