Posted by: tpsciencefun | September 30, 2009

Look Out Your Window!!

Take time to enjoy our fall weather.  Be sure to look out your window often and explore outside.  Remember, nature is free for all to enjoy and explore!

Experiment with an Anemometer

 Experiment to see if you can make the cool weather tool below. Let me know how it works!!


Meteorologists use anemometers to measure wind speed in one area. With this data, they can determine how quickly a storm, or weather system, will travel to other areas.

Build Your Own Weather Tool!
Use the materials and follow the directions below.

• Five 3-ounce paper cups
• Hole punch
• One straight pin
• Pencil (with eraser)
• Scissors
• Stapler
• Two straight plastic straws
• Watch with a second hand


  1. Punch one hole in each of four paper cups, about ½” below the rim. Color the outside of one of the cups.
  2. In the fifth cup, punch four evenly spaced holes about ¼ ” below the rim.
  3. Push a straw through the hole of the colored cup. Fold down the tip of the straw inside the cup, and staple it to the cup on the side opposite the hole.
  4. Push the straw through two opposite holes in the four-hole cup. Attach another cup to the opposite end of the straw. Make sure that the second cup faces the opposite direction from the first cup.
  5. Repeat the above step with the other two cups and straw.
  6. Position the four cups so that they face the same direction — clockwise or counterclockwise. Make sure the cups are all the same distance from the center.
  7. Poke a hole in the bottom of the center cup. Push the eraser end of the pencil through the hole.
  8. Push the pin through the intersection of the two straws. Then push it into the eraser as far as possible.


  1. With a friend, take the anemometer outside to an open area where the wind is blowing.
  2. While one of you times exactly one minute on the watch, the other counts how many times the colored cup goes by in one minute. This is the number of revolutions per minute (RPM).
  3. Convert your answer for RPM to miles per hour (MPH) using this formula:
    RPM X 0.2142 = MPH
  4. Record.


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