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  #31  
Old 08-14-2004, 10:13 AM
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Quote:
Originally Posted by Duke2.6
I use Pledge furniture polish -

Duke
I use Pledge Cedar scent and like it a lot. It does not last very long, unfortunately.

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  #32  
Old 08-18-2004, 07:18 PM
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Quote:
Originally Posted by Jim Anderson
Ultraviolet light does not pass through glass.
Inferred light does not pass, ala green houses and hot car interiors. Most frequencies of UV light do pass thus faded interiors.
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  #33  
Old 08-18-2004, 07:34 PM
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Quote:
Originally Posted by bryanm
Inferred light does not pass, ala green houses and hot car interiors. Most frequencies of UV light do pass thus faded interiors.

Correct -


The UV comes into the car - gets absorbed and converted to infrared (heat) - then the glass holds the infrared in making it super hot.


If glass couldn't pass UV plants would die in greenhouses
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  #34  
Old 08-18-2004, 10:11 PM
RES RES is offline
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Another thing you may want to try if you park your car in the sun, is a sun shade. It is a bit of a nuisance, but it also keeps the car cooler.
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  #35  
Old 08-19-2004, 02:05 PM
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uv

that's odd, I remember vaguely doing an expereiment in a micro lab where we held plastic petri dishes of bacteria under a UV light with and without the plastic covers on the dishes. The take home points of the experiment were that the bugs were sensitive to UV and that UV did not penetrate too deeply, i.e., through the cover of the dish. As for the idea that if glass blocked UV plants would die in greenhouses seems counterintuitive. If UV light is known to cause eventual DNA mutations... why would plants miss it? I believe plants absorb all visible light other than green -which is reflected back for us to see pretty leaves with. Most likely some UV penetrates through glass and plastic and that is why people put additional protection on glasses and windshields.

CDT
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  #36  
Old 08-19-2004, 03:22 PM
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Quote:
UVA rays damage does not show up right away. They do not cause painful sunburn, but their effects are very real and long lasting. They account for about 95% of all ultraviolet energy and release energy throughout the daylight hours. UVA's have the power do permanent damage to our DNA, as well as to the elastin and collagen fibers that make our skin firm and healthy. They can pass through all glass including windows, windshields, and sunglasses.
Quote:
UVB rays do burn your skin. Though they don't delve as deep into the skin's layers as UVA's, UVB's can damage the DNA at the heart of skin cells, and are a main cause of skin cancer. UVBs cant pass through glass but they do reflect off light colors such as sand, white decks, snow, etc.
http://vt.essortment.com/waystoprotect_rqgu.htm
Quote:
Increasingly, the medical community and consumer media are paying attention to the dangers of ultraviolet (UV) ray penetration into automobiles. Most people believe they are safe from the sun’s harmful UV rays whenever they are shielded by glass. In cars, however, UV protection is generally far from complete. The windows and windshield somewhat reduce exposure to UVB (short wave radiation between 290 and 320 nanometers) but only the windshield comes partially treated against UVA (long wave radiation between 320 and 400 nanometers) in the form of a plastic laminate. The other windows block little or none. Even factory installed solar tinted glass will only absorb less than ten percent of UV rays. This is important because UVA represents 90 percent of all UV radiation reaching the earth.
http://www.usglassmag.com/backissues/9905/9905uvconcerns.html

There are more sites I could quote. But while a large portion of UVb rays are blocked by glass.. no UVa rays are. And they make up a bulk of the UV rays hitting your car.
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  #37  
Old 08-19-2004, 03:29 PM
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Quote:
Originally Posted by tunk
that's odd, I remember vaguely doing an expereiment in a micro lab where we held plastic petri dishes of bacteria under a UV light with and without the plastic covers on the dishes. The take home points of the experiment were that the bugs were sensitive to UV and that UV did not penetrate too deeply, i.e., through the cover of the dish. As for the idea that if glass blocked UV plants would die in greenhouses seems counterintuitive. If UV light is known to cause eventual DNA mutations... why would plants miss it? I believe plants absorb all visible light other than green -which is reflected back for us to see pretty leaves with. Most likely some UV penetrates through glass and plastic and that is why people put additional protection on glasses and windshields.

CDT
Plants don't need UV?

You must have missed the lecture on photosynthesis in 5th grade
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  #38  
Old 08-20-2004, 08:26 AM
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Wink uv

billabong,

The following was a little insulting, I didn't miss it there was just a real cute girl in my class that I had my eye on Actually, because of reasons like that I missed most of the middle school classes too.

"Plants don't need UV?
You must have missed the lecture on photosynthesis in 5th grade"


I posted after I had searched on line to double check what I had intuitively thought. I read that:

Chlorophyll a & b absorb light in the red and blue regions of the visible spectrum...

if your 5th grade class was furhter along than mine, perhaps you'd be willing to share...

CDT

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