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Regional Gliding School  The pressure of the atmosphere at any point is due to the weight of overlying air. Pressure at the surface of the earth is.

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Presentation on theme: "Regional Gliding School  The pressure of the atmosphere at any point is due to the weight of overlying air. Pressure at the surface of the earth is."— Presentation transcript:

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3 Regional Gliding School  The pressure of the atmosphere at any point is due to the weight of overlying air. Pressure at the surface of the earth is normally measured by the mercury barometer and is expressed in inches of mercury. The mercury barometer consists of an open dish of mercury into which the open end of an evacuated glass tube is placed. Atmospheric pressure forces the mercury to rise in the tube. The great the pressure the higher the column rises. Mercury Barometer Mercury Dish Glass Tube Atmospheric Pressure Vacuum

4 Regional Gliding School  Pressure  Force per unit area  Inches of Mercury  The unit used to measure the length of a column of mercury in the barometer ("Hg).  Millibars  The pressure exerted on an area of 1 square cm by a force of 1000 Dynes (mb).  Kilopascals  Equals 10 hectopascals  One hectopascal equals one millibars (hPa). Unit of Measure

5 Regional Gliding School ICAO - International Civil Aviation Organization Û a)Mean sea level pressure Û 29.92”Hg Û mb Û kPa Û c)Air is a perfectly Û dry gas Û d)Lapse rate is Û 1.98°C/1000ft Û b)Mean sea level temperature Û15°C

6 Regional Gliding School Density is mass per unit volume. Pressure and Density are directly proportional. As density increases so does pressure.

7 Regional Gliding School NOTE: You must use the buttons in the Confirmation Stage

8 Regional Gliding School A B C D 15 o C 1.98 o C 2.0 o C o C Let's try a few review questions on Meteorology: Question #1 - Describe the ICAO mean sea level temperature? Meteorology Atmospheric Pressure and Density

9 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

10 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

11 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

12 That answer is correct. Let's move on...

13 Regional Gliding School A B C D Inches of Mercury Isobar kilopascals Both A and C Let's try a few review questions on Meteorology: Question #2 - What are the units of measure of pressure? Meteorology Atmospheric Pressure and Density

14 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

15 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

16 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

17 That answer is correct. Let's move on...

18 Regional Gliding School Altimeter Setting The barometric pressure reading is used to adjust the altimeter for variations in existing atmospheric pressure or to the standard altimeter setting. If set to the existing pressure it will read the true elevation of the airport above sea level. It is measured in inches of mercury.

19 Regional Gliding School Meteorological Aspects of the Altimeter When flying from an area of high pressure to an area of low pressure the altimeter will read higher than what the aircraft is actually flying. HL Intended Path Actual Path HIGH TO A LOW, LOOK OUT BELOW

20 Regional Gliding School Meteorological Aspects of the Altimeter When flying from an area of low pressure to an area of high pressure the altimeter will read lower than what the aircraft is actually flying. LOW TO A HIGH, CLEAR BLUE SKY H L Intended Path Actual Path

21 Regional Gliding School NOTE: You must use the buttons in the Confirmation Stage

22 Regional Gliding School A B C D Aerodrome Area Sea Ground Let's try a few review questions on Meteorology: Question #3 - The altimeter reads the altitude above level. Meteorology Atmospheric Pressure and Density

23 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

24 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

25 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

26 That answer is correct. Let's move on...

27 Regional Gliding School Let's try a few review questions on Meteorology: Question #4 - What unit of measure is the altimeter expressed in? Meteorology Atmospheric Pressure and Density A B C D Inches of Mercury Isobar kilopascals Both A and C

28 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

29 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

30 I’m afraid that answer is incorrect Let's try again... Flying Scholarship Program

31 That answer is correct. Let's move on...

32 Regional Gliding School Congratulations!! You have now completed the Atmosphere Pressure and Density lesson of the Meteorology Module. Of course, this lesson is always available to you for future reference if required. You are now ready to move along to the next Meteorology lesson you have not completed or to any other module you wish. You can advance to the Self Test Module if you feel ready to challenge the final exam. Good Luck! Meteorology Atmospheric Pressure and Density


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