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From: haapanen@watdcsu.UUCP (Tom Haapanen [DCS])
Newsgroups: net.cooks,net.flame
Subject: Re: Truth in Advertising?
Message-ID: <642@watdcsu.UUCP>
Date: Sun, 11-Nov-84 15:39:41 EST
Article-I.D.: watdcsu.642
Posted: Sun Nov 11 15:39:41 1984
Date-Received: Mon, 12-Nov-84 19:20:49 EST
References: <2559@dartvax.UUCP>
Organization: U of Waterloo, Ontario
Lines: 31

< Namin nami nami nami ... >

I still can't believe the ignorance prevailing in journalism today!
For someone to draw the conclusion that since black cars get hot in
the sun, then black pots must radiate lots of waste heat is
incredulous!  This person should have at least consulted a basic
physics text.

Obviously, black absorbs the most heat, as it does not *reflect* light
rays of any wavelength.  On the other hand, a silver car will reflect
most light rays (waves?  particles?).

On the other hand, an object of colour x can only radiate light (read:
heat) of colour x (i.e. that wavelength).  Therefore, a 100% black pot
will radiate *no heat* at all.  It will be warm to the touch, though.
However, it is impossible to make a 100% black pot (if it was 100%
black, it would absorb all the light and you wouldn't be able to see
it!), but an almost-black pot is still the best way to go.

:-( :-( :-(  Journalism today  :-( :-( :-(


Tom Haapanen		University of Waterloo		(519) 744-2468

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