>>13010400states of a chemical species are a function of pressure and temperature. O2 and H2 can be liquids at differing temps and press. Assuming atmospheric conditions and 75° F, watters structures really likes being a liquid. The main reason is hydrogen bonding which is the strongest intermolecular force. The partial negative charge on the oxygen in water attracts nearby hydrogen apart of other water molecules and these hydrogens are partially positive. This hydrogen bonding is very strong, you can think of it like velcro. water in these conditions really dont want to be in a vapor state. Additionally, usually the larger the molecule, the higher the boiling point. Going from H2O to H2O2 brings the boiling point up by 100°F! Its all because of hydrogen bonding. FYI, I am a chemical engineer
