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All materials transmit heat at different rates. This is called thermal conductivity. Sand has a higher thermal conductivity rate than grass/wood/leaves.


Martin (not Weiss)


 

Martin S. Fisher

Executive Director

Science Central

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Fort Wayne, IN  46805

Phone: 260-424-2400 ext. 441

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41°5'52" N  85°7'8" W  756 ft. 


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Date:    Tue, 16 Sep 2008 11:28:15 -0400
From:    "Daniels, Alissa" <[log in to unmask]>
Subject: why is sand hot?


We were talking about our new green roof recently, and made the comment = that the green roof is cooler than a traditional tar roof; any kid who = has ever walked on the grass and then on the driveway can relate to = that. The black roof absorbs a lot of heat.=20

But then someone said "well, how about the sand on the beach? it's white = AND hot." And we batted around a few ideas ranging from "well, it's = still cooler than the black roof,  and "well, the grass and the soil = hold water, so that keeps it cool" and "it must have to do with the = shape of the grains of sand..."

Anyone else have any thoughts on this? Something to think about if your = September is as quiet as our September.

AD

~~~~~~~~~~~~~~~
Alissa Daniels, Science Program Manager/Senior Educator Boston Children's Museum
617 426 6500 .342
"The most exciting phrase to hear in science, the one that heralds new = discoveries, is not "Eureka!" (I found it!) but "That's funny..."=A0=A0" = --Isaac Asimov ~~~~~~~~~~~~~~~

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