Re: [at-l] By the numbers

[Bruce Dreyer <bdreyer@mindspring.com>]

1 joule = 16.68 mw-seconds
1 square meter = 10,000 square cm


1 joule/square meter = 16.68 mw-s/10,000 sq cm  =  .001668 mw-s/sq cm

I think

Bruce Dreyer
Stumblefoot

"David F. Addleton" wrote:
> 
> I'll need mathematical help here:
> 
> You can get the joules/meter squared for sunlight uv hitting the Great
> Smoky Mountain National Park observing station by going to
> http://oz.physast.uga.edu/docs/greatsmoky/Great99.htm
> 
> In 1999 it started in january less than 1000, but rose to about 5,000 in
> june. Tilt of earth in summertime closer to the sun accounts for some of
> this, but they're also trying to see the effect of Ozone on absorption. It
> looks as if you could adopt an "average" around 3000 for the sake of
> simplicity and estimate.
> 
> My question:
> 
> What's the relationship between joules/meter squared and milliwatt seconds
> per centimeter squared? Can you tell me how many joules in a milliwatt
> second (or vice versa, which ever is the larger unit)?
> 
> This may go a long way in clarifying the comparison between sunlight and
> the steripen.
> 
> Thanks.
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