Hopefully this question makes sense; when talking about solubility of a gas does this have any relation to its ability to mix with another gas? i.e. gas solubility in gas, versus, gas solubility in liquid In ultrasonic cavitation some say that a more soluble gas can more easily enter the bubble from the liquid and cushion the collapse of the bubble, others say a more soluble gas is more able to leave the bubble into the liquid. The latter makes sense to me, the former does not. Why should a gas dissolved in a liquid be more able to enter a gaseous bubble in the liquid because of it being "more soluble". Any ideas / comments welcome!