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SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
For FULL presentation click HERE >> www.warnescience.net
Air Pressure
Keith Warne
SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
For FULL presentation click HERE >> www.warnescience.net
Air Pressure
• Gas molecules ...
Standard Atmospheric Pressure
• The pressure that supports 760.0 mm of
mercury is known as STANDARD
ATMOSPHERIC PRESSURE o...
Water Barometer
• The pressure that supports 760.0 mm of
mercury is known as STANDARD
ATMOSPHERIC PRESSURE or 1
ATMOSPHERE...
SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
For FULL presentation click HERE >> www.warnescience.net
Atmospheres mm Hg kPa
1 760 1...
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For FULL presentation click HERE >> www.warnescience.net
Aneroid Barometer
• An aneroi...
HIGH
PRESSURE
HIGH
PRESSURE
HIGH
PRESSURE
Aneroid Barometer
CHANGE
LOW
PRESSURE
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Pressure Demonstrations - Plunger
High Pressure
If the plunger
is forced
down the air is
forced out of
the cavity.
Low Pre...
Heated air escapes replaced
by STEAM
Can crushing Experiment
Water boils - atmospheric
pressure balanced by steam
inside.
...
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For FULL presentation click HERE >> www.warnescience.net
Ball Pressure
• A ball needs ...
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Aerodynamics & Air Pressure
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For FULL presentation click HERE >> www.warnescience.net
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SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
For FULL presentation click HERE >> www.warnescience.net
Hi -
This is a SAMPLE present...
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Gas Pressure P

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A set of slides created to teach Gas Pressure P to learners at Bishops Diocesan College in Cape Town.

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Transcript of "Gas Pressure P "

  1. 1. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Air Pressure Keith Warne
  2. 2. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Air Pressure • Gas molecules move rapidly in all directions. • Collisions exert a force on objects and the container. • The number of collisions determines the total force being exerted. • Increasing number of collisions would INCREASE Pressure. The pressure is given by the AVERAGE FORCE PER UNIT AREA.
  3. 3. Standard Atmospheric Pressure • The pressure that supports 760.0 mm of mercury is known as STANDARD ATMOSPHERIC PRESSURE or 1 ATMOSPHERE. (1 atm) taken at sea level. • Since liquid pressure can be found by P = gh  = density of liquid = 13 590 kg/m3 (mercury) g = gravitational field strength = 9.807 N/kg h = height = 0.7600 m p = gh = (13590)(0.76)(9.807) = 101 300 Pa Pa = 1atm H = 760mm 1 Pa = 1 N/m2 ATMOSPHERIC pressure SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
  4. 4. Water Barometer • The pressure that supports 760.0 mm of mercury is known as STANDARD ATMOSPHERIC PRESSURE or 1 ATMOSPHERE. (........................) taken at sea level. • What would the equivalent height of water be? • Since liquid pressure can be found by P = gh  = density of water = .................kg/m3 g = gravitational field strength = 9.807 N/kg h = height = ...........?? m p = gh ATMOSPHERIC pressure WATER!WATER! H = ?? m SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
  5. 5. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Atmospheres mm Hg kPa 1 760 100 2 ??? ??? 0.5 ??? ??? X ??? X ??? X ??? X ??? atm kPa Pressure Conversions
  6. 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Aneroid Barometer • An aneroid barometer has a vacuum chamber that expands or contracts with changes in air pressure. • The expansion/contraction causes a series of levers to pull on a chain that is connected to a spindle. • The spindle turns and moves the needle attached to it on the dial, showing the air pressure. From World Book © 2002 World Book, Inc., 233 N. Michigan Avenue, Suite 2000, Chicago, IL 60601. All rights reserved. World Book illustration by Zorica Dabich
  7. 7. HIGH PRESSURE HIGH PRESSURE HIGH PRESSURE Aneroid Barometer CHANGE LOW PRESSURE SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
  8. 8. Pressure Demonstrations - Plunger High Pressure If the plunger is forced down the air is forced out of the cavity. Low Pressure If the plunger is pulled up – the pressure inside the cavity is DECREASED so the atmospheric pressure on the outside is GREATER and it holds the plunger against the surface. Air escapes! SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY
  9. 9. Heated air escapes replaced by STEAM Can crushing Experiment Water boils - atmospheric pressure balanced by steam inside. Steam condenses to water – no gas inside to balance atmospheric pressure – ATMOSPHERE CRUSHES CAN! WATER
  10. 10. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Ball Pressure • A ball needs pressurized air inside it to enable it to bounce. • The higher the pressure the better (HIGHER) the ball will bounce. • If the atmospheric pressure increases a higher pressure will be needed in the ball.
  11. 11. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Aerodynamics & Air Pressure
  12. 12. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net + + + + + + + + + + ++ + + + Pumping air out of the jar causes the balloon to inflate!
  13. 13. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Hi - This is a SAMPLE presentation only. My FULL presentations, which contain loads more slides (with all the gaps filled in) as well as other resources, are freely available on my resource sharing website: www.warnescience.net (paste into your browser if link above does not work) Have a look and enjoy! Keith Warne
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