Thursday, March 25, 2010
David Webb Demonstration
So on Wednesday, David Webb and his wife Joan Webb came to our chemistry class and did a bunch of great experiments that had to do with pressure!!! He told us that gases and liquids, which are fluids, go from high pressure to low pressure. He showed us a soccer ball and told us that the pressure inside the ball is above the atmosphere pressure and that's why the ball bounces. I learned that the higher you go up, for example all the way up Mt. Everest, the less gas there is, so its harder to breathe. David Webb told us that there is 14.7 pounds per square inch of pressure here on Earth and 0.1 pounds per square inch of pressure on Mars. He also did an experiment with a washer and a feather. Outside of the vacuum, when the feather and washer are dropped to the ground at the same time, the washer drops to the ground faster. But inside the vacuum the feather and washer drop to the bottom at the same time, this is because there is not a lot of air molecules in the container to resist the feather from falling. I learned that sound transition needs gas molecules, gas density, to work. I also learned that Otto Von Guerike was the first person to do the magdeburg experiment. In class when we did the experiment it took 168 pounds to separate the two hemispheres. Click on Magdeburg to learn about the experiment.
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