Isobars and Air Pressure Video
Environmental Science
Name: _____________________________________________________ Period: _____ Date: ________
Essential Question: How do isobars influence the wind and the weather?
Air Pressure Explained!
1. What happens to the air pressure as we go higher up in the atmosphere?
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2. When does air contract?
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3. When does air expand?
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4. What is a barometer?
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5. What does it mean by low pressure (L)?
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6. What does it mean by high pressure(H)?
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Isobar Contours
7. What is the average atmospheric pressure?
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8. What are low pressures?
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9. What are high pressures?
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10. What is the interval between isobars?
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11. Which states have bad weather?
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12. What do you notice about the distances between isobars in areas of low pressure compared to the area of
high pressure?
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13. How do I draw Isobars
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How to predict the weather?
14. What are isobars?
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15. What kind of wind is present when isobars are close together?
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16. What kind of wind is present when isobars are wider apart from one another?
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17. Why do we need to know the direction of the wind when predicting the weather? Think!
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18. Using the weather map on the right, identify the air pressure in the following states.
a. California ___________________
b. Nevada ___________________________
c. Utah, Wyoming, Colorado ________________
d. North Carolina ______________________
e. Indiana, Ohio, Kentucky ________________
f. Wisconsin ___________________________
19. Which states are experiencing good weather?
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20. Which states are experiencing bad weather?
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Multiple Choice: Write the letter of your answer on the space before the number.
____1. Although we cannot see air pressure we know it exists because
A. It is measured on a thermometer. C. We feel it when air presses against us.
B. It is measured on a hygrometer.
D. When isobars are closer are close together the wind is strong.
____2. When molecules are heated they
A. Move faster and spread out
C. Move slower and come together
B. Stay still
D. Are not affected
____3. Differences in air pressure on a map are shown with
A. clouds
B. isobars
C. temperature readings
D. isotherms
____4. Air pressure is measured with a
A. hygrometer
B. psychrometer
C. thermometer
D. barometer
____5. Areas with low pressure generally have
A. Sunny weather
B. Precipitation
C. Dry weather
____6. Areas with high pressure generally have
A. Sunny weather
B. Precipitation
C. Dry weather
____7. What do isobars show?
A. Atmospheric pressure
B. Temperature
C. Rain
D. Elevation
____8. Wind moves _____.
A. From high to low pressure B. From low to high pressure C. Between high and low pressure
____9. As you climb a mountain, the air pressure __________.
A. increases
B. remains the same
C. decreases
D. fluctuates
R. E. Angat
Key:
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8.
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C
A
B
D
B
A
A
A
C
KEY:
a. California __1016__________
b. Nevada _____1020______________________
c. Utah, Wyoming, Colorado ______1024______
d. North Carolina _______1016_____________
e. Indiana, Ohio, Kentucky ______1008________
f. Wisconsin _________1012________________
19. Which states are experiencing good weather?
______ Utah, Wyoming, Colorado _________
20. Which states are experiencing bad weather?
____ Indiana, Ohio, Kentucky ______