9/9/10

Post date: Sep 09, 2010 9:24:22 PM

Bell Ringer: Describe a situation where you would want something to experience very high pressure. How can you increase the pressure?

• 3.3 Notes

  • 3.3 Demos

    • Pressure

      • The air around us exerts pressure on us. A bottle of water with a single hole in the bottom will not leak because the pressure inside the bottle is equal to the pressure outside the bottle. When the bottle is squeezed, there is more pressure inside than out, so water comes out the hole.

    • Bernoulli's Principle

      • A ping pong ball floats on a jet of air from a compressor, hair dryer, or straw. The fast-moving air has lower pressure than the still air around it, which sucks the ping pong ball in.

      • Blowing out through a funnel will capture a ping pong ball for the same reason.

    • Pascal's Principle

      • Two connected bottles are filled with water. The bottom bottle has holes poked in it. When the top bottle is squeezed, water shoots out of each hole at the same time with the same force. The pressure in the top bottle is transferred evenly throughout the bottle, making water come out everywhere at the same time.

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