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WEATHER WORLD

 A PRESSING MATTER! 0601, 0602, 0603, Additional Activities

 

POP GOES THE EAR!

Are you ready for another trip? It is time to pack the car again and visit more of our great state. This time your trip will begin in St. George. After a day of hiking in the sun, you will travel North on I-15 to Provo. Once there you will head up Provo Canyon to your final destination in the Uintah Mountains. (Yes, you have taken a virtual trip there before, but the Uintah Mountains are cool enough to visit a couple of times.) While on this virtual trip, you have passed the time by playing the "ABC" and license plate games with you sisters. Suddenly, you feel a funny, crunching in your ear and you are unable to hear what your little sister said. Something has happened to your hearing. You yawn, take a drink of soda, and chew some gum to try to get your ears to "pop." Not long after your ears crunched, your mother starts complaining about her ears. What is happening and what does it have to do with the atmosphere?

DO IT!

Think about the question above and then record your answer. Highlight the box below to see if you are correct.

ANSWER:

Your ears "popped" because of the weight of the surrounding air. As you travel up the canyon to the mountains, there is less air pressing on your eardrums. This causes the eardrums to adjust, which causes the uncomfortable sensation we call "popping".

 

 

"WEIGH" TO GO!

Compared to a rock or even a feather, air does not weight very much. But air is a gas made up of tiny molecules of matter. Air has weight. It is pressing all around us. Air pressure is the weight of air in our atmosphere pressing down upon the Earth.

YOU'RE THE SCIENTIST!

You can prove that air has weight by performing the following activity.

MATERIALS: This is what you need.

  • Meters stick
  • String
  • Two balloons

PROCEDURE: This is what you do.

  1. Tie a 24-inch piece of string in the middle of the meter stick.
  2. Tie a 6-inch piece of string on each balloon.
  3. Attach the string with the balloons on each end of the meter stick.
  4. Make sure the balloons balance.
  5. Remove one balloon and blow it up.
  6. Attach it to the end of the meter stick again.
  7. Does it balance? What has happened?
  8. Explain how this activity demonstrates that air has weight.
  9. Design and perform another experiment to demonstrate that air has weight.

 

"PRESSING" INTO THE FUTURE

Meteorologists, the scientists who study the weather, call air pressure "Barometric Pressure". A barometer is a weather instrument used to measure the air pressure. Changes in air pressure usually mean a change in the weather. Stormy weather often occurs after the barometer falls, or the air pressure decreases. Good or fair weather usually can be predicted by a rising barometer. You can learn how to use a barometer to predict the weather.

GO THERE!

  1. By clicking on the barometer above, you can find out more about this weather instrument. Write a short summary on you findings.
  2. Use the Internet to find out how to make your own barometer.

 

 

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Copyright © by the Utah State Office of Education.

Created July 20, 2000 by Kathleen Ochsenbein