The Combustion Reaction of Hydrogen

Combustion reactions involve the reaction of a substance with oxygen, producing heat and light energy as by-products.
Hydrogen is a highly reactive element, and when it combusts, it reacts rapidly with oxygen.
The chemical equation representing the combustion of hydrogen is 2H2(g) + O2(g) -> 2H2O(g).
In this reaction, two molecules of hydrogen gas (H2) react with one molecule of oxygen gas (O2) to produce two molecules of water vapour (H2O).
This is an example of a complete combustion reaction, as it produces water and releases energy, with no leftover hydrogen or oxygen atoms.
It is also considered an exothermic reaction, meaning it releases energy in the form of heat and light. This is why hydrogen gas can be used as a fuel source.
This combustion reaction is very efficient, as for every gramme of hydrogen that burns, a large amount of energy is released.
The main by-product of hydrogen combustion, water, is harmless to the environment. This contrasts with the combustion of fossil fuels, which can produce harmful gases like carbon dioxide and sulphur dioxide.