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12.1

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Transcript

  • 1. Characteristics of Gases 12.1
  • 2. Gases are FLUIDS
    • Fluid not liquid
    • Fluid because they can flow.
  • 3. Gases have low density
    • Long distance between particles
      • Gas particles have to travel a long distance before they collide with each other.
  • 4. Gases are compressible
    • Gas particles can be moved closer together with PRESSURE.
      • Increased pressure = decreased volume
      • Decreased pressure = increased volume
  • 5. A gas will completely fill its container.
    • Gas particles are constantly moving.
    • Gas particles do not attract each other.
  • 6. Gas Pressure
    • Collisions of gas molecules cause air pressure.
    • Atmospheric pressure = the weight of the air above you.
      • Higher up = less air above = less pressure
  • 7. http://video.about.com/pediatrics/Ear-Pressure.htm
      • http://youtu.be/ZNLNeHySon0
  • 8. Measuring Pressure
    • Pressure = force/area
    • SI unit for force = newton (N)
    • SI unit for pressure = pascal (Pa)
    • Atmospheric pressure is measured with a barometer.
  • 9. STP
    • Standard Temperature and Pressure = 0 0 C and 1 atm.
    • Avagadro came up with this to compare gases.
    • http://www.youtube.com/watch?v=13WUqWd_Yk8&feature=related
  • 10. Kinetic-Molecular Theory
    • 1. Gas particles are in constant, rapid motion.
    • 2. Gas particles are far apart.
    • 3. Gases are fluids.
    • 4. Gases can be compressed.
  • 11. Pressure Conversions…
    • Pressure can be measured in several units.
      • psi, torr, pascals, N/m 2 , inches of Hg, mm Hg
    • All of the units can be converted to each other.
    • The conversion works just like MOL ISLAND.
  • 12.  

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