Awesome experiments

In chem we had a guest come in and show us some experiments that had to do with pressure, air, the atmosphere and gravity. I learned a couple things with the demos that he did like that Otto Von Guericke invented the vaccum pump. I also learned that fluid substances flow from high to low pressure. So the experiements were fun and I got to participate in one of the experiments and It was fun to have a guest in the class to learn from someone different.