H₂ (Molecular Hydrogen)

Molecular hydrogen (H₂) is the simplest and most abundant molecule in the universe, consisting of two hydrogen atoms bonded together. It is a colorless, odorless, and highly flammable gas. H₂ plays a crucial role in various scientific and industrial applications, including fuel cells for clean energy, rocket propulsion, and chemical manufacturing. Naturally, it is found in stars and gas clouds in space, and on Earth, it can be produced through methods like electrolysis of water. Due to its high energy content per unit weight, hydrogen is considered a promising clean fuel source for sustainable energy systems.