The hydrogen would rapidly escape into space, leaving behind an atmosphere of oxygen gas.

So bubbling oxygen gas through water is the usual way to do it.

Over time it will slowly become oxygen gas and water through decomposition.

When it acts as a reducing agent, oxygen gas is also produced.

This can lead to oxygen gas being released in blood vessels with potentially dangerous effects on the fish.

The other new molecule they make is called oxygen gas.

A diver needs, on average, about 1 mole of oxygen gas per hour.

It is also used to make oxygen gas in high school and college labs.

But warmer water is unable to dissolve as much oxygen gas.

Instead, the fish are breathing O2 (oxygen gas) that is dissolved in the water.