A gas balloon is a type of balloon that is filled with a lighter-than-air gas, such as helium or hydrogen, represented by the emojis 🎈💨. It floats in the air due to the difference in density between the gas inside the balloon and the surrounding air. The gas provides buoyancy, allowing the balloon to rise and float in the sky. Gas balloons are often used for recreational purposes, scientific research, or as a means of transportation in certain events like hot air balloon festivals.