HEY GUYS, I’M BACK!!! I know, I know, its been way too long since my last post. (About a year ago to be exact) But nevertheless, I’m back and I’m going to make this my first post of the new year. I’m also going to be doing more post, hopefully on a more regular basis. Lastly, wanted to thank all of you, who followed, liked and commented on this blog; I do see and read everything, so once again thanks!
So anyway, with all that out of the way, let’s get to it.
This question, as many of them do, literally just popped in my head as I was chewing gum earlier this morning.
So normally when you blow a bubble, you are pushing air onto the bubble’s soapy surface. The pushing of air in scientific terms is known as “pressure”. Near the surface of the Earth, there are a lot of air molecules pushing on each other. So the pressure near the surface is high. As you go higher in the atmosphere, there are less and less air molecules, so the pressure gets lower.
When you blow a bubble, you are exerting a high amount of pressure into the bubble. The bubble is being pushed on the inside by air from your breath, but is also being pushed on the outside by air in the atmosphere. When the bubble leaves the wand, the air inside the bubble has the same amount of pressure as the air outside the bubble.
The bubble may float for a while, as the air outside the bubble tries to stay the same as the air inside. Eventually, however, the bubble will pop. If the bubble floats too high in the atmosphere, the pressure inside the bubble will become too great, and the bubble will explode in a big ‘POP’. If the bubble sinks too close to the ground. The pressure inside the bubble becomes lower than the pressure outside and the bubble will implode. We still hear it as a ‘POP’.
This equilibrium of pressure, combined with surface tension is what gives a bubble its round shape. In the vacuum of space, however, there would be no pressure on the outside of the bubble to equal out the pressure from within, so the air inside would burst the bubble instantly.