i asked this in chemistry but have been asked to come here so here goes. why, when H&O2 come together (apparently there must be 6 molecules before water appears) does this liquid manifest it's self. now i know the mechanics involved but i want to beyond this.if i seperate H from O2 no liquid appears (maybe always there?) so why when H&O2 come together does a liquid appear? what is the liquid a manifestation of? also we know that both H&O will become liquid(that is another query!) on there own at sufficiently low temperatures,now when i bring the two (elements) together it seems that the temperature for liquefaction rises why? and why expand when frozen? does the lower temperature allow a little more fluid in? or is there an energy flow blocked so the the liquid cannot flow back so expands? do H&O work together as some sort of catalyst,in temperature and energy flow? i think that perhaps there is more going on inbetween the nucleous and the electron shell of atoms. when you think about it,we know why and how water becomes. but we really don't know WHAT it is!! any thoughts?