I would like to ask a question that is Hydrogen is gas but 2 hydrogens forms water molecule H2O.How can it possible?

Please if anybody know the answer plz reply me.

Hi Student,
Formation of water molecule from hydrogen and oxygen is a chemical change.
Chemical process is process which results in the formation of a new compound whose properties are entirely different from the initial substances.
So, hydrogen and oxygen are two gases which react with each other and the product form is a liquid.
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