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Air Pressure, Forces, and Motion Meteorology 101 Dr. Robert M MacKay

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Pressure Temperature Volume The Gas Law P=C*density*Temp P=2.87 T

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Gas Laws

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Constant P as T increases V Increases/decreases Constant V as T increases P Increases/decreases Constant T as V increases P Increases/decreases Constant V,T as M increases P Increases/decreases

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Gas Laws Constant P as T increases V Increases/decreases Constant V as T increases P Increases/decreases Constant T as V increases P Increases/decreases Constant V,T as M increases P Increases/decreases

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Mercury Barometer Pressure Measurement 1013 mb = 1013 hPa Millibar hectoPascal 1013 mb 29.92 in Hg 76 cm Hg 760 mm Hg 760 Torr 14.7 psi

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Station Pressure + Elevation(meter)/10 = Sea Level Pressure

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Newtons Laws of Motion Newtons 3 laws of motion 1. Law of inertia 2. Net Force = mass x acceleration ( F = M A ) 3. Action Reaction

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1st Law (Law of Inertia) Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it. acceleration = 0.0 unless the objected is acted on by an unbalanced force

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1st Law Inertia (The intrinsic tendency of an object to rest changes in motion) Mass is a measure of an objects inertia Mass is also a measure of the amount of an objects matter content. (i.e. protons, neutrons, and electrons)

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Newtons 2nd Law Net Force = Mass x Acceleration F = M A

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Newtons Law of Action Reaction (3rd Law) You can not touch without being touched For every action force there is and equal and oppositely directed reaction force

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Forces that influence the wind 1. Pressure Gradient Force 2. Coriolis Force 4. Friction On average gravity nearly balances the vertical Pressure gradient (hydrostatic balance)

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Pressure Gradient=P/dist

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Pressure Gradient

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Centrifugal force an (Apparent Force)

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Coriolis Force (apparent force due to Earths rotation)

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Coriolis Force

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