{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Ch4 (1) - Fall 2009 Atmospheric Pressure& Wind Chapter4...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Fall 2009 Atmospheric Pressure & Wind Chapter4 - FIRST TOPIC: ATMOSPHERIC PRESSURE Recall from Chapter 1: Pressure 1s defined as the force per unit area. ' The ressure at any level 1n the atmosphere depends on the amount of air (or mass) ‘ that level. Pressure always ' ' with height. .--u-—._-_--_--__-_-_-__---_-___---- ........................... Pressure Change How can the pressure at some place in the atmosphere change? To understand how, let’s look at the equation of state (also known as the ideal gas law) (you won’t have to memorize this equatiOn) P = pR—T where P = pressure, p = density, R is a constant and T = temperature ‘. What this equation says is pressure will change if the a ( If t ‘3] ‘5 changes . or the 'thV‘PWTMV—O changes hiTTC.I'T., For a given volume, pressure will change if the amount of in that volume changes. In other words, if density changes. How does temperature affect density and pressure? The average (or mean) temperature in an air column affects the way pressure decreases with height. Consider two columns of air Both contain the same amount of mass but column A . . , . is colder than column B. (We re talking about the average temperature in each column)_ ' A muonmuse, E) TWRWL * CRIBWY‘O doom» .; goon. 0H WM!“ U63 «gm; : f‘SUD . _ A I 1 .M. 35' t _ _ 3.», i mg m; l 53"— - ' \mamw ' . _ .3 Which column has the hi her densi ? Answer: g ty ‘HWQ. 'i'QWP‘i VCGALV C, Wt“ LV W \Gje, ‘Hfle mm, on— wwcm QYQIfiAYC dQCVfltSe 3 A w \th vflng WES/wt, Nut cletvmge, 0““ 0t warm" more, wit-tn comer CKW YCVWCV WOW NCW men mfi-—uv;'m__ . :__._. ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern