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H is the chemical symbol for the element hydrogen.

Hydrogen is the first element on the periodic table and the most abundant element in the universe. It is a colorless, odorless, tasteless, and non-metallic gas. Hydrogen is highly flammable and can form explosive mixtures with air.

Hydrogen is used in a variety of applications, including:

• As a fuel for rockets and fuel cells

• In the production of ammonia, fertilizers, and plastics

• In the refining of petroleum

• In the production of glass and ceramics

• In the welding and cutting of metals

Hydrogen is also a promising source of clean energy. Hydrogen fuel cells produce electricity through a chemical reaction between hydrogen and oxygen, and they emit only water vapor as a byproduct.

Properties of hydrogen:

• Atomic number: 1

• Atomic mass: 1.008

• Melting point: -259.14 °C (-434.45 °F)

• Boiling point: -252.87 °C (-423.17 °F)

• Density: 0.0899 g/L

• Solubility in water: 0.018 ml/100 ml

Hydrogen is the lightest and most abundant element in the universe. It is a colorless, odorless, and tasteless gas. Hydrogen is highly flammable and can form explosive mixtures with air. Hydrogen is used in a variety of applications, including as a fuel for rockets and fuel cells, in the production of ammonia, fertilizers, and plastics, and in the refining of petroleum.