I just unpacked a box that arrived with frozen food in it. It was packed with dry ice. Many of us know that dry ice is frozen carbon dioxide gas. It is very cold and stays that way without getting anything wet because when it "melts" it is merely turning into a gas. Remember your high school physics and Boyles Law/Charles' Law. Put a gas under pressure and it gets smaller. Release the pressure and it gets bigger and releases coldness, endothermic reaction remember? I am geeking out. See this link on gas laws.
I needed to dispose of the dry ice so that the dogs or anyone else did not touch it directly as it is too cold to safely hold with your bare skin or risk frostbite. The little kid in my came out and I of course filled up a bucket of water and put it in the water. Instant fog show. Always fun to make fog billow across the ground. I also put some in the sink and watched it bubble up.
Got me to thinking about bubbles and string theory and how it works so I googled is and looked at some of how it is described. A bit beyond my math, but string theory and quantum mechanics all seem to come together with bubbles.
"Like a bit of froth on the crest of an ocean wave, our observable universe may be nothing more than a sliver sitting within the edge of a bubble that's constantly expanding into a higher dimension."
"While this mind-boggling idea might sound like something out of a physicist's fever dream, it is in fact a new endeavor to reconcile the mathematics of string theory with the reality of dark energy, a mysterious, all-pervading cosmic force that acts in opposition to gravity."
Gets a little mind boggling for me but it makes sense on a micro scale if you watch bubbles coming from dry ice in a sink with some water. Here is my ultra low quality video of what spurred this thought for the day.