What is hydrogen?

Hydrogen is 14 times lighter than air, making it the lightest atom on earth.
Hydrogen is the most abundant element in the universe.
Invisible and inodorous are two main characteristics of hydrogen.
Hydrogen emits no CO₂ while burning, it can be produced 100% from green electricity.
Hydrogen can be stored as a gas under pressure (usually 350 or 700 bar) or as liquid (cooled down to -253°C).

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