Stuck in someone else's frames? break free!

HomeScience HomeGases Home
Animals
Astronomy

Animals HomeAstronomy HomeAtoms HomeEcology HomeLiquids HomeMeteorology HomeMicroorganisms HomeOceanography HomePlants HomeSolids Home

MAKING A FANCY BAROMETER

Here's a really fancy barometer. Remove the cork from a small thermos bottle. Drill a hole through the cork, just large enough to insert a plastic straw or glass tube. Seal the cork in the thermos bottle by dripping candle wax all around the cork where it enters the thermos.

Mount the thermos upside down on a stand so that the end of the tube is about 1/4 inch from the base of the stand. Wrap the thermos in rock wool or some other insulating material and fit a cardboard box snugly around it.
The insulation will help to keep the instrument from acting more like a thermometer than a barometer. (What is the difference?)

Now color some mineral oil with food coloring. Listen to the radio weather report, and on a day when the air pressure (barometric pressure) is going to be low (the low should be below 29.30 inches), we'll experiment with our barometer. Set a cup of the colored mineral oil beneath the tube.

If you take an occasional look at your barometer, you will see that when the air pressure rises, the mineral oil is pushed up the tube.
A scale can be placed behind the tube so that changes can be noted numerically.

If you remember from previous barometer activities, this instrument will work indoors as well as outdoors, since the air pressures are about the same.

 
Contact Spike
Any problems with this page? Send URL to webmaster.  Thank you!
 
 
Add to Favorites
 
 
Search this site powered by FreeFind
 
 
 

Send this page to a friend


Back to Spike's & Jamie's Recipe Collection

 

 

 

 

Sign Guestbook    View Guestbook

 

We publish two newsletters a couple of times a month. To subscribe, send a blank email to the appropriate email address.  Topica will send you a message asking if you really intended to subscribe - just click reply - that's it!

Free Recipe Collection Newsletter:
freerecipes-subscribe@topica.com

Jewish Recipe Collection Newsletter:
jewishrecipes-subscribe@topica.com

 

 

Barnes & Noble Home Page  Barnes & Noble Music Page

 

Tired of Geek Speak when 
you have Computer Questions?

 

 

 

WatkinsOnline.com