Water can also be a gas, (water Vapor) and a solid (ice) the state of it all depends on how “hot” matter is, if you cool down oxygen real low it will become a liquid aswell. It just so happens to be, water is a liquid between 0-100 degrees Celsius
Also oxygen and hydrogen aren’t a gas, they are molecules which happen to be in a gas form at room temperature
edit: i made a mistake.
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