For our Weekend Fun Lesson, we observed what happens to water when it freezes.
I let my daughter fill our Popsicle molds all the way to the brim with
water. Then, I carefully carried them to the freezer so that it
wouldn't spill. After a couple hours, we pulled it out to make our
observation: the ice rose above the top! It is kind of hard to see in the picture below, but the ice is bubbling above the brim of the molds, and some liquid even started to spill out and then freeze on the side. So, the kids discovered that when
water freezes, it expands! Now we know that if we want to make frozen
treats, we should make sure we leave a little room at the top to allow
for expansion!
(I think this experiment works even better if you have a container that is a perfect cylinder, rather than the shaped mold I used)
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