WW2010 University of Illinois
Name ____________________________
ECO-SCIENCE: WW2010 University of Illinois – Packet 2
To start each module always log on to:
ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/home.rxml
After logging on to the site above, click on the “Forces and Winds” module. You will have 1 day of lab time to answer questions 66-90. MAKE GOOD USE OF YOUR TIME! The answers are in order. Click on either one of these arrows at the bottom of the page
to go to the next page. Once you have completed questions 66-90 you can work on the extra credit module “Light and Optics”.
III. Forces and Winds
66. What is pressure? ______________________________________
________________________________________________________
________________________________________________________
A. Pressure
67. Draw a diagram off to the right,
of a column of air.
68. What happens to the column of air when pressure increases?
________________________________________________________
________________________________________________________
69. What happens to the column of air when pressure decreases?
________________________________________________________
________________________________________________________
70. Atmospheric pressure is measured with what instrument? ______
71. The average air pressure at sea level is 14.7 pounds per square inch (lbs/in2). On television, pressure is given in _________ (_____).
Average air pressure at sea level in this unit of measurement is ______
72. The unit of measure found on weather maps and used by meteorologists is ______________________(____).
Average air pressure at sea level in this unit of measurement is ______
73. Which unit of measurement is in English units and which is in Metric units?
________________________________________________________
74. The number of air molecules _____________ with height and so _______ also decreases with height.
75. Under what altitude does half of the molecules in the atmosphere exist? _________. What would that level be in millibars? _________
76. Why does the air pressure drop so quickly close to the earth and then at a slower rate further from the earth?
________________________________________________________
________________________________________________________
77. Lines on a weather map that connect points of equal pressure are called _______________.
78. A new Isobar is drawn every _____ millibars (mbs).
The 1032 isobar has been drawn for you. Draw the 1028, 1024, 1020, 1016, 1012, and 1008 mb isobars for the following pressure reports.
[pic]
79. What is an isobaric surface? _____________________________
________________________________________________________
Draw a simple diagram to show different isobaric surfaces in the atmosphere.[pic] 80. Using the table above approximately how high above the ground is the 500 mb pressure surface? ___________ ft or __________ m
81. The 5 atmospheric variables or conditions that are usually kept tracked of are _______________, _________________, __________________, _______________, and __________________.
82. Which is more dense and compacted together, warm air or cold air?____
83. Explain how a given pressure surface can have a different height at different locations. (use a diagram and word explanation)
________________________________________________________
________________________________________________________
________________________________________________________
________________________________________________________
84. Word Association with a HIGH pressure center.
Letter = _______ Color = ___________
Another name = _______________________
Winds flow = ____________________ into or out of a HIGH pressure center. (scribble out the wrong answer above)
Movement of air = sinking or rising
(scribble out the wrong answer above)
Kind of weather associated with a HIGH pressure center = ________ 85. Word Association with a LOW pressure center.
Letter = _______ Color = ___________
Another name = _______________________
Winds flow = ____________________ into or out of a LOW pressure center. (scribble out the wrong answer above)
Movement of air = sinking or rising
(scribble out the wrong answer above)
Kind of weather associated with a LOW pressure center = _________
B. Pressure Gradient
86. What is “pressure gradient”? _____________________________
________________________________________________________
________________________________________________________
87. A pressure gradient force causes the air to move from a ________
pressure center to a ____________ pressure center.
C. Coriolis Force
88. The winds deflect or curve to the right in the Northern Hemisphere due to the __________________ _________________.
89. This force increases as the winds become _______________ and as you get closer to the earth’s _____________.
Geostrophic Winds
90. Winds that flow parallel to the isobars because of the balance between the pressure gradient force and the coriolis force are called _______________ winds.
Draw a simple diagram of this type of wind.
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1032
1032
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