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Vacuum

Pinhole. Gas. Vacuum. Pinhole. Gas. Vacuum. Diffusion vs. Effusion. Diffusion - The tendency of the molecules of a given substance to move from regions of higher concentration to regions of lower concentration Examples: A scent spreading throughout a room

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Vacuum

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  1. Pinhole Gas Vacuum

  2. Pinhole Gas Vacuum

  3. Diffusion vs. Effusion Diffusion - The tendency of the molecules of a given substance to move from regions of higher concentration to regions of lower concentration Examples: A scent spreading throughout a room or people entering a theme park Effusion - The process by which gas particles under pressure pass through a tiny hole Examples: Air slowly leaking out of a tire or helium leaking out of a balloon

  4. Effusion Particles in regions of high concentration spread out into regions of low concentration, filling the space available to them.

  5. Weather & Air Pressure HIGH pressure = good weather LOW pressure = bad weather

  6. Weather and Diffusion LOW Air Pressure HIGH Air Pressure Map showing tornado risk in the U.S. Highest High

  7. Hurricane Bonnie, Atlantic Ocean STS-47

  8. Hurricane WilmaOctober 19, 2005 88.2 kPa in eye

  9. NET MOVEMENT To use Graham’s Law, both gases must be at same temperature. diffusion: particle movement from high to low concentration effusion: diffusion of gas particles through an opening For gases, rates of diffusion & effusion obey Graham’s law: more massive = slow; less massive = fast

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