George,
There are no "stupid" questions. Oxygen is a "Henery's Law" gas which means it is sparingly soluble in water. For example at 20 deg C and 1 atm pressure you can only dissolve 9.17 lb O2per one million pounds of water. The O2 molecules are moving around in the liquid and are too dilute to be ignited. Any energy, such as a torch, is totally absorbed by the H2O.
Jim

Jim S.
tutor
Here's a link that describes how fish manage to breathe the dissolved oxygen in water.
http://www.myuniversalfacts.com/2006/03/how-do-fish-breathe.html
Jim
Report
05/24/14
George H.
05/24/14