Air pressure
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Air Pressure. Elbow Chat. What is weather? Describe the weather today. Write this in your notes!. Weather: condition of Earth’s atmosphere at a particular time and place . It can change day to day. Question:. Does air have mass? Prove it with our balloon lab. Review.

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Air Pressure

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Air Pressure


Elbow Chat

  • What is weather?

  • Describe the weather today.


Write this in your notes!

  • Weather: condition of Earth’s atmosphere at a particular time and place.

  • It can change day to day.


Question:

  • Does air have mass?

  • Prove it with our balloon lab.


Review

  • Air is made of individual molecules that each has their own mass

  • Air has mass, which means it has “pressure”.

  • Pressure: force pushing on an area


Air also has DENSITY

  • Density – the amount of mass per unit volume

  • D = M/V

  • As air pressure decreases, the density of air decreases.


Elbow Chat

  • The weight of the column of air above your desk is about the same as the weight of an entire school bus!

  • Why does it not crush us?


  • The air pressure does not crush us because air molecules push in all directions, not just down on us. So the pressure evens out.


Elbow Chat

  • Observe the device in this picture on the right.

  • What do you think this is called?

  • What do you think it is used for?


Write Barometer in weather factor chart (3E):

  • Barometer: tool used to measure air pressure (AP)

  • AP drops – stormy (Low pressure system) aka: Lousy weather

  • AP rises – clear (High pressure system) aka: Happy weather


  • Listen carefully to the following video. You and your elbow partner will have a few questions to answer at the end.

VIDEO


Elbow Chat on the Video (answer the questions on your paper in complete sentences)

  • 1. What force is pulling air down?

  • 2. Can the weight of air change? Explain.

  • 3. In which type of temperature (hot or cold) do molecules move faster?

  • 4. Which direction does cold air travel (up or down)?

  • 5. Does temperature affect air pressure? Explain.


Write everything from now on!

What force is pulling air down?

  • Gravity


Can the weight of air change? Explain

  • Yes.

  • Hot air – lighter Cold air - heavier


In which type of temperature (hot or cold) do molecules move faster?

  • Hot air


Which direction does cold air travel (up or down)?

  • Sinks down because it is more dense


Does temperature affect air pressure? Explain.

  • Yes.

  • Hot air rises and cold air comes down to take its place.

  • This makes the air move, which causes changes in weather.


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