My son used Exploring Creation with Physical Science during his 8th grade year (2000-2001) and we all enjoyed the experiments from that book. Recently I went through some old photographs and came across the pictures from experiment 3.2. If you want to read more about ex. 3.2 see Michelle’s blog here: Apologia Physical Science Ex. 3.2. Michelle is doing a homeschool co-op this year and she has posted several articles in her blog about her classes.
In my first set of lesson plans for ex. 3.2, I recommended that you fill two 2-liter bottles with water and freeze them. Someone ask me why years ago and the reason is to make your water as cold as possible.
After successfully doing the experiment right, we did it backwards. We placed the bottle in hot water and then we put the balloon on the bottle. We submerged the bottle in the icy cold water and the balloon was pulled into the bottle.
Then we submerged the bottle in the very hot tap water and the balloon popped out of the bottle.
This seemed fun to us, so we put it back in the cold water to watch the balloon go back into the bottle, then into the hot water to see it pop out. We did that several times.