I’ve never really understood how that works. Chemistry wasn’t my best subject in high school, and it’s been over a decade since then for me.

  • The O in H2O is oxygen, but it isn’t dissolved oxygen.
    It’s part of water. A water molecule consists of 2 Hydrogen atoms and an Oxygen atom.

    The oxygen atom has chemically bonded with the hydrogen atoms. The O there isn’t existing as a separate gas.
    So, The dissolved oxygen is something different from the O in H2O.

    And the dissolved oxygen is influenced by things like temperature, pressure, other things dissolved in the water n all.