also, does liquid hydrogen become water (vapor) in the presence of oxygen (gas or liquid?). Can anyone explain more? Thanks.
I believe O2 (or the oxygen we breath) is used as a fuel source for a Hydrogen Fuel cell, as for your next question Hydrogen becomes Water when ignited, when ignited the Hydrogen reacts with the Oxygen in the air, or around it to form H2O, if the state of which the Hydrogen is present matters; I am not entirely sure. Also, when combining Hydrogen and Oxygen to form water the amount of water produced is very little compared to the space the 2 Gases took up to create the Water.
