Re: heat value in each color in sunlight - science demo doesn't work well


mack Wrote:
> For a high school science demonstration, I've made
> up a panel of shallow boxes, each with a thermometer
> and different color internal back (white, black, red,
> yellow, green, blue) and put them in the window
> facing the sun. ........
> Thanks Joe
>
> You're attempting to measure thermal [long IR] energy and correlating
> it against colours in the visual spectrum. Apart from the factors of
> local absorption and reflection within the boxes two apparently
> identical colours could produce totally different results. It is
> amazing to note that chlorophyll in [green] living plants is a near
> perfect reflector of near IR [eg white in IR photogrphy and excellent
> 'shade' material for buildings] although it appears dark to the
> eye;-).
>
> Try http://home.freeuk.com/m.gavin/infrared.htm for sample IR
> photography of some metals - bright stainless steel for example is
> renowned for getting very HOT in sunlight [eg absorbs IR] and would be
> the worst material for an astro-dome!
>
> Nytecam 51N 0.1W


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nytecam
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