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Masses. Air Pressure. Air pressure is the force of air, exerted on the objects on Earth’s surface W e are being pushed from every direction Pressure is measured by a tool that we call a barometer Pressure, or changes in air pressures are what give us winds. Air Pressure.

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Air pressure
Air Pressure

  • Air pressure is the force of air, exerted on the objects on Earth’s surface

  • We are being pushed from every direction

  • Pressure is measured by a tool that we call a barometer

  • Pressure, or changes in air pressures are what give us winds


Air pressure1
Air Pressure

  • Air movement (wind) moves from areas of high pressure to areas of low pressure

  • The Corioliseffect, the rotation of Earth that causes the ocean currents to deflect, will also cause the wind to deflect as well

    • Northern Hemisphere → Right

    • Southern Hemisphere → Left

  • Wind speed is measured by an instrument known as a aneometer


Pressure centers
Pressure Centers

  • Pressure Centers are areas where concentrated pressure will affect the weather in a given area.

  • There are two types of Pressure Centers

    1. High Pressure Centers (Cyclones)

    • Pressure will be highest on the inside and lowest on the outside

    • Winds will blow clockwise and outwards from the centers

    • accompanied by fair weather and sunny skies


Pressure centers1
Pressure Centers

2. Low Pressure Centers (Anti-cyclones)

  • Pressure will be highest on the outside and lowest on the inside

  • Winds will blow counterclockwise and outwards towards the center of a center.

  • Accompanied with poor weather and rain


Pressure map
Pressure Map

  • Isobars or lines of equal pressure are shown on the map

  • When isobars are close together, the winds will have a higher velocity

  • When isobars are far apart or spread out, the winds will have a lower velocity


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