air pressure
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Air Pressure. What is air pressure? How does it affect weather?. Air Pressure. Can you feel air pressure?. - PowerPoint PPT PresentationTRANSCRIPT
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Air Pressure
What is air pressure? How does it affect weather?
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Air Pressure
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Can you feel air pressure?
When you take off or land in an aircraft, your ears may hurt or feel uncomfortable. This is because your eardrums can feel changes in air pressure as the aircraft moves quickly up and down.
But what is air pressure?
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What is Air Pressure?
• It is caused by the weight of all the air in the atmosphere pressing down on Earth.
• It is also known as atmospheric pressure.• Air pressure changes with the height and also
when air warms up or cools down. • Changes in air pressure cause changes in the
weather.
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Air Pressure
Air’s pressure is pretty heavy at sea level. It is equivalent to (like) an elephant balancing on
a desk!
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Air Pressure
There is more pressure near the Earth’s surface and less when you go further into the atmosphere.
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Quick Write!
• Where is air pressure higher? On a mountain or near the beach? Why?
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What do you remember about Hot and Cold air?
Draw a picture here
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Differences in air pressure
Low Pressure• When air rises, it leaves behind an area of
lower pressure, because the upward- moving air is not pressing down so hard on the surface.
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High Pressure• Areas of high pressure
are formed where air is sinking back down, and so pushing down harder.
• >> see the diagram
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• Since there are many areas of high and low pressure above the Earth’s surface due to uneven surface heating.
• Air moves from high pressure to low pressure forming winds.
• As a result, the greater the difference between the high pressure and low pressure areas is, the higher the wind speed is.
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Highs and Lows
• Pressure is different all over the world.
• Lows are areas of low pressure with the lowest pressure at the center.
• Lows usually bring wet, cloudy weather.
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• Highs are areas of high pressure with the highest pressure at the center.
• Highs bring sunnier, and dry weather.• The way these move from day to day
causes the changes in the weather.
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Cold Air High Pressure looks like this
in weather:
Creates
High Pressure
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Hot AirLow Pressure looks like this in
weather:
Creates
LowPressure
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Quick Write
High Pressure • What are its causes and
effects?
Low Pressure• What are its causes and
effects?
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Your Turn!Compare and Contrast
What is low and high pressure? What are their causes? How are they different or the
same?
Complete the worksheet. Make sure you include both diagrams and writing. Fill out the whole sheet. It is worth 5 points.
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Measuring Air Pressure• Air Pressure is measured in millibars (mb) on a
barometer. • The simplest kind of barometer is a mercury
barometer and pressure is measured in mm (in) of mercury.
• An aneriod barometer can measure move conveniently.
• A barograph is a special kind of barometer, which records continuous changes in air pressure.
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Photos I
• A aneroid barometer
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Photos II
• A barograph