# What would happen to the ocean when lowering atmospheric density?

Suppose one fine day a mischievous god decided to eradicate all air molecules on Earth in an instant, my question is what will hapen to the ocean? Please kindly disregard (omit) your concern for life in your answer the extremophiles can have the last laugh I don't really care.

Kindly split your answer into 2 parts one for when the average air density is at 50% and another is when the air is totally gone, thanks.

• If all the air is removed instantaneously, why would there be a halfway mark? – Frostfyre Jun 17 '15 at 5:12
• @Frostfyre this instant occurs at no time at all for us but last eons for this divine entity so in order not to upset Poseidon in one go hence the trial. – user6760 Jun 17 '15 at 5:15

• As Samuel alluded, the Earth's oceans possess quite a bit of dissolved gasses in them. As the water boiled, those gasses would be released too so you wouldn't end up with a pure water vapor atmosphere. Oceans contain between 0 - 8.5 mL $O_2$ / $L_{water}$, 8.5 - 14.5 mL $N_2$ / $L_{water}$, and $CO_2$ too. – Jim2B Jun 18 '15 at 3:11