Not sure I understand how this is supposed to work, water expands when frozen. Something that melts would reduce in volume so it should never explode a container if it couldn't do so while still frozen.
Not sure I understand how this is supposed to work, water expands when frozen. Something that melts would reduce in volume so it should never explode a container if it couldn't do so while still frozen.
Looks like a water-balloon-esque thing. The solid ice keeps it in shape after being cut while you get a popped balloon if you cut it after it's melted
Not sure I understand how this is supposed to work, water expands when frozen. Something that melts would reduce in volume so it should never explode a container if it couldn't do so while still frozen.
The reason is air pressure from outside. While indeed frozen water/aka ice increases in volume when frozen and goes back when melted, because of expansion inside to container, a balloon like this time, makes the container become stretched. So, when there's just a little of it melted, only the outer most is liquid while everything is still frozen solid, that keeps the container stretched but when there's an opening, air pressure won't let the container keep itself stretched and will push it to former shape, thus, pushing the liquid water out through the opening. And you know balloons, just the slightest opening that makes what it contains guts out, it pops.
Solution is simple, wait for it to melt a little more, which will decrease the pressure on the container, which, in turns, will lead to no explosion/no sudden gust of cold water in your face. Though of course, it have to have melted enough to explode on your face.
Sorry because I'm not familiar to all the English physic's terms and I'm not even all that good at it. I just know because I often put water in a plastic bottle, freeze it and go to school back in the days.
The reason is air pressure from outside. While indeed frozen water/aka ice increases in volume when frozen and goes back when melted, because of expansion inside to container, a balloon like this time, makes the container become stretched. So, when there's just a little of it melted, only the outer most is liquid while everything is still frozen solid, that keeps the container stretched but when there's an opening, air pressure won't let the container keep itself stretched and will push it to former shape, thus, pushing the liquid water out through the opening. And you know balloons, just the slightest opening that makes what it contains guts out, it pops.
Resolution is simple, wait for it to melt a little more, which will decrease the pressure on the container, which, in turns, will lead to no explosion/no sudden gust of cold water in your face. Though of course, it have to have melted enough to explode on your face.
Sorry because I'm not familiar to all the English physic's terms and I'm not even all that good at it. I just know because I often put water in a plastic bottle, freeze it and go to school back in the days.
Your analysis is spot on. It's because there's a thin layer of liquid within the slightly-melted balloon and a (still) solid core that causes this kind of explosion. Once the balloon's been cut, air pressure from the outside can force the balloon against the solid ice cream core, causing the liquid content to be forcefully ejected.
I've been wanting to eat one of those for a while, but I never had the opportunity to buy them, even when I pass by where they sell it almost everyday.
