Why does cold water contain more oxygen then hot water?

Question

Why does cold water contain more oxygen then hot water?

Answer 1

Your question does not say "dissolved Oxygen", so the above answer is correct insofar as that goes.  But your question does not say that.  So cold water contains more oxygen as in H2O because cold water is more dense than hot.  More weight per unit volume, hence more oxygen.

Answer 2

The solubility of a gas in a liquid goes up with a decrease in temperature. For example, cold soda contains more carbon dioxide (i.e., fizz) than warm soda. The solubility increases because the gas has less kinetic energy and therefore, less ability to escape from the liquid.

Answer 3

Because the oxygen break down to a gas under heat and rise up out of the water, called evaporation. that is the bubbles, you see in a pot of boiling water

Answer 4

because in hot water the oxygen evaporates while in the cold water the oxygen is preserved thats why when you boil the water long enough you end up with nothing =)