How much oxygen is required

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

Idont know. if you want an answer you need to give us some context dude.