Air can be dissolved in water. I read some information that the dissolved air exists in the form of molecule, for example, oxygen can be dissolved in the water, and the fish can get dissolved oxygen from the water, which is said to be in the form of molecule, but I can not find related publication or pictures about the existence form of dissolved air or oxygen in the water. Somebody can provide any information or articles about this topic? i need to know whether the dissolved air affects the compressibility of the water, as air-bubbles definately do, but I dont know about dissolved air. Thanks all guys.