What I Learned At The Expo

I went on a field trip to Madison to an Expo. I saw the wonder of physics. I thought that it was cool when the lady took a glass of water and put it on a plate with strings attached to it and swung it in a circle upside down and it didn’t spill. Then she showed us liquid nitrogen and she did a lot of things with it. First she told us how the fog formed. Next she poured water in it and the water froze, but the nitrogen was boiling because it is so cold and the and the air is really hot compared to the nitrogen. Next she took a little bit of the nitrogen and put it in a small like cannon made of copper she pounded the cap of cork in with a hammer and after like 20 seconds it would blow the cover off and hit the ceiling really hard. Jessica