The most commonly used gas in balloons is helium. Helium is a colorless, odorless, inert gas that is lighter than air, which allows balloons filled with it to float. This property of buoyancy is why helium is often chosen for party decorations or events. Helium is safe and non-flammable, making it a popular alternative to hydrogen, which is flammable and poses safety risks. The use of helium has become widespread in the entertainment industry, especially for creating balloon arrangements and displays. However, there are concerns about helium scarcity, prompting discussions about sustainable alternatives for balloon inflation.