I learned about expansion and contraction in this chapter. I had alot of fun doing the labs in class with my group. I liked the one when we had the balloon on top of a water bottle and there was a bucket of hot water and a bucket of cold water. Then we had to put the water bottle with the balloon on top of it into one of the buckets. In the hot water, the balloon blew up a little bit (It expanded). Then, we quickly switched the bottle from the hot water to the cold water and the balloon got smaller (It contracted).  I loved that lab. It was my favorite one so far. I also learned about expansion, contraction, conduction, convection, and radiation. What i didn't like so far this year is the tests. I don't like tests. I love labs !!! How about you?!