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Pressure

Pressure. Pressure = Force / Area Units of Pressure = Pascal = Newtons/meter 2. What is a Gas?. Air Pressure Direction. Pressure Balancing Act. Ideal Gas Law. P = NkT/V N = Number of Particles T = Temperature of the Gas V = Volume of the Container k = 1.38 x 10 -24 J/K.

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Pressure

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  1. Pressure Pressure = Force / Area Units of Pressure = Pascal = Newtons/meter2

  2. What is a Gas?

  3. Air Pressure Direction

  4. Pressure Balancing Act

  5. Ideal Gas Law P = NkT/V N = Number of Particles T = Temperature of the Gas V = Volume of the Container k = 1.38 x 10-24 J/K

  6. Change Air Pressure by Changing Amount of “Stuff” • Increase number of particles (N) increase pressure (P) • Example: Inflating a balloon • Decrease number of particle, decrease pressure • Example: Deflating a balloon

  7. Changing Air Pressure by Changing Temperature • Decrease the temperature (T), particles move slower, decrease pressure • Example: Cooling a balloon • Increase the temperature, particles move faster, increase pressure • Example: Balloon heating up

  8. Changing Air Pressure by Changing Volume • Increase the volume of the container, decrease pressure • Example: Breathing in • Decrease the volume of the container, increase pressure • Example: Breathing out

  9. How Much is the Air Pushing on Newspaper? Force = Pressure x Area = Pressure x (Length x Width) = 100,000 Pa x ________ m x _________ m = __________ N “Weight” = __________ N / 9.81N/kg = __________ kg = __________ lbs

  10. How Does It Work?

  11. Canadian Coast Guard HovercraftLower Mainland Based CCG CG-045 • Built in 1969 • Length: 14.76 m • Breadth: 7 m • Weight: 18 tonnes • Max Speed: 50 knots 92.6 kph • Out of service • Oct 8, 2002

  12. Canadian Coast Guard HovercraftLower Mainland Based CCG SIYAY • Built in 1998 • Length: 28.5 m • Breadth: 12 m • Weight: 70 tonnes • Max Speed: 48 knots 88.9 kph

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