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    12.1 12.1 Presentation Transcript

    • Characteristics of Gases 12.1
    • Gases are FLUIDS
      • Fluid not liquid
      • Fluid because they can flow.
    • Gases have low density
      • Long distance between particles
        • Gas particles have to travel a long distance before they collide with each other.
    • Gases are compressible
      • Gas particles can be moved closer together with PRESSURE.
        • Increased pressure = decreased volume
        • Decreased pressure = increased volume
    • A gas will completely fill its container.
      • Gas particles are constantly moving.
      • Gas particles do not attract each other.
    • 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
    • http://video.about.com/pediatrics/Ear-Pressure.htm
        • http://youtu.be/ZNLNeHySon0
    • Measuring Pressure
      • Pressure = force/area
      • SI unit for force = newton (N)
      • SI unit for pressure = pascal (Pa)
      • Atmospheric pressure is measured with a barometer.
    • 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
    • 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.
    • 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.
    •