Air Pressure, Forces, and Motion

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

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

3. Gas Laws

4. 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

5. 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

10. 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

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

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

25. 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

26. 1st Law Inertia (The intrinsic tendency of an object to rest changes in motion) Mass is a measure of an object’s inertia Mass is also a measure of the amount of an object’s matter content. (i.e. protons, neutrons, and electrons)

27. Newton’s 2nd Law • Net Force = Mass x Acceleration • F = M A

28. Newton’s 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

29. 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)

30. Pressure Gradient=∆P/dist

31. Pressure Gradient

33. Centrifugal force an (Apparent Force)

34. Centrifugal force an (Apparent Force)

35. Coriolis Force (apparent force due to Earth’s rotation)

36. Coriolis Force

37. Coriolis Force

38. Coriolis Force

39. Coriolis Force