This week, we had two presenters on block day. We learned about atmospheric pressure. When pressure is below pressure, it is a vacuum, which basically means that there is no air. Gas and all fluids flow from high pressure to low pressure. 14.7 pounds per square inch is the atmospheric pressure on earth. Whenever we are in a higher elevation, there is less gas. One of the experiments they showed was with a balloon. Mr. Webb blew a small balloon. They took out the air around the balloon and the balloon expanded. I have seen the feather and the washer experiment before in eighth grade. I learned about the Magdeburg hemispheres. In my class, two boys were able to pull the hemispheres apart because they could overcome the force of the pressure. The can crush was different from the one we did in class. Mr. Webb's can was like a spiral. In another experiment, the water boiled with heat. As the water boiled longer, the water grew colder.
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