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Krampf #490 More Cooling
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KRA-@aol.com
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Jun 09, 2007 20:52 PDT
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Robert Krampf's Experiment of the Week:
#490 More Cooling
Greetings from Hot Springs, Arkansas. After a week with my parents in
Memphis, Nancy and I headed west in search of crystals, diamonds, fossils, and good
friends. You can find photos and descriptions of our adventures so far on
my blog: http://www.thehappyscientist.com
The Basic Concepts in Science Video Series is now posted on my website. You
can watch all 6 of the Earth Science videos for free, and you can also buy
them on DVD, if you want them in your library. You can find the videos at:
http://www.krampf.com/BCIS.html IMPORTANT! Don't pay the full $17.95 for the
DVD! As an Experiment of the List member, you can still get a copy for
$14.95. Just go to: http://www.krampf.com/DVDspecial.html
Check out this week's science video to see how to make flowers change colors.
Make green violets, red marigolds, and many other strangely colored
blossoms. You can find the video at:
http://www.krampf.com/experiments/Science_Experiment12.html
If you have not checked out the videos, give them a try. They are short,
load quickly, and fun.
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This week's experiment is a continuation of experiment #488. While the fan
just moves air around, you can actually use it to help cool the room.
For this investigation, you will need:
two washcloths
water
Wet one of the washcloths, and squeeze out the excess water. Place the wet
washcloth and the dry washcloth where you can easily reach them. Place one
hand on the table. Pick up the dry cloth in your other hand. Gently fan the
cloth over your hand, and notice how cool your hand feels. Then do exactly
the same thing with the wet cloth. You should notice that the air moved by
the wet cloth makes your hand noticeably cooler. Why?
Think back to the reasons why a fan makes you feel cool. Evaporation! As
moisture from your skin evaporates, it absorbs heat from your skin, making you
cooler. As you fan your hand with the wet towel, water from the towel is
evaporating. As it evaporates, it absorbs heat from the air around it, making
the air cooler. This cooler air blows across your skin, making you feel
cooler.
If you are ever stuck without air conditioning, open two windows so you will
get a breeze through the room. In front of the window where the air is
entering the room, hang one or more wet towels. As the breeze evaporates the
water from the towels, the air in the room will be cooler.
Of course, you could also cool yourself by holding a bowl of ice cream
against your skin, but it works better if the ice cream is cooling you from the
inside.
Have a wonder-filled week!
Robert Krampf
Robert Krampf's Science Education Company
www.krampf.com
The Happy Scientist Blog
http://web.mac.com/krampf/iWeb/Site/TheHappyScientist/TheHappyScientist.html
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