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Hydrogen gas (chemical symbol H₂) is the lightest and most abundant element in the universe. It is a colorless, odorless, tasteless, and highly flammable gas at room temperature. Hydrogen exists as a diatomic molecule, meaning each molecule is composed of two hydrogen atoms (H₂).

Air balloon gas typically refers to gases like helium (He) or hydrogen (H?) used to fill hot air balloons or lighter-than-air balloons. The most common gas used for smaller balloons (e.g., party balloons) is helium, due to its non-flammable properties.