We have a cold day today (around zero). We took a few minutes to see what happens when you take a balloon outside in the cold.
I hope you can tell from the two pictures that the balloon shrinks as you are outside in the cold. This is because gasses decrease in volume when there is a decrease in temperature. Elijah stood outside for under 10 minutes with the balloon. He wanted to go for longer, but I decided it was too cold out there.
The other way we demonstrated this was to blow up a balloon inside of a plastic container.
Here is our first attempt with the balloon in a container.
The balloon’s volume definitely decreased. The next thing we knew, the balloon was floating away (and popped)!
For the next attempt in the container, I put the balloon in further.
Unfortunately, my pictures weren’t the best for demonstrating, but the balloon was clearly smaller each time we checked.
You might want to mark the container so that it is even more noticeable.
By the way, it also is quite fun to freeze colored water inside of a balloon. (We did that a few weeks ago.)
I hope you get a chance to enjoy the cold weather!