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A barometer uses mercury because:
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Ymri001

by Ymri001 at July 28, 2011

A) it is the only liquid metal at room temperature. B) it is a convenient, safe, lightweight material. C) the density of mercury is very large which allows the barometer to be short. D) it is the traditional substance used, water could be as easily used. E) All of the above are true.

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C.  If you used water (which has been done) you would need a tube over 30 feet tall.  Figure Hg is 13.6 times the density of water.  760 mm of Hg is supported by 1 atmosphere of pressure.  That is 76 cm or 29.92 inches.  A water barometer would be 13.6 times as high or 33.9 feet!
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kroo_jteague kroo_jteague July 28, 2011

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This Brightstorm video will help you. Go to http://www.brightstorm.com/science for more help. Good luck! edit
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bumsoo_one bumsoo_one October 12, 2011

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