Because Hydrogen and Oxygen are gases that have electrons surrounding them, making them negatively charged
The negative charge of the electrons push other molecules away, so it has to be much colder to bring them together to form a solid
When hydrogen and oxygen bond together, those electrons are attracted to the oxygen molecule, which make a H2O like a magnet, one postive side and one negative side.
Those molecules dont repel each other, and bond easier, meaning it doesnt need to get as cold to cause them to slow down and link up
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