# Bubbles of Different Size

Suppose that I have 2 bubbles of different sizes located in a liquid, and assume that both of those bubbles are close to one another. What exactly will happen to both of those bubbles? From a surface tension standpoint, I know that the smaller bubble will have higher pressure gas inside than that larger bubble. So, would the smaller bubble be sucked into the larger bubble? Is there a better way to explain this? I know that, if the bubbles were attached with, say, a nanowire, then the pressure gradient would force the smaller bubble's gas into the larger bubble's, but I'm not sure what happens when they're both separated. Any insight/clarification to my interpretation would be greatly appreciated.

• "but I'm not sure what happens when they're both separated" - nothing happens when they're separated... Oct 2, 2014 at 17:39
• ...........why? What if there's a thin film of liquid between them? Oct 2, 2014 at 17:55
• Can you define what you mean by: close and separated?
– BMS
Oct 2, 2014 at 19:42
• is there any type of fluid motion? what type of fluid? what type of bubble? are we talking about gas bubbles from you in a bathtub or bubbles in a bubble chamber? there is too many variables to give a simple "yes or no" answer to your question… if you r talking about "forever" suspended bubbles nothing should happen, but i have been wrong before
– user60226
Oct 2, 2014 at 21:56
• Thanks for the response. In this case, I'm considering gas bubbles in an infinite chamber of liquid. By close, I mean that the distance between each bubble's interface is less than each bubble's respective radius but great enough such that they don't overlap at t=0. Oct 3, 2014 at 0:48