flacaltenn
Diamond Member
That`s the whole point I was making ...it takes a near perfect black body to convert visible & uv into heat.
Black paint does not absorb UV anywhere near the amount as it absorbs IR.
Try it !
So does every compound that has pi-bond electrons. They all absorb UV, but that does not heat up any of these compounds by the equivalent amount of "heat energy" with which they have been irradiated.
Think about it..!
These pi bond electrons re-emit the same amount of energy as light which they have absorbed.
So from where would you get the energy it takes to heat up x- grams of the substance by y- degrees ?
That conversion to heat happens only in a substance that does not have any of the resonant bond electrons at the frequency of the light which they would have re-emitted....
For a quantitative conversion from light to heat you need a black body.
And as far as black bodies go, it depends on the wavelength how effective of a black body a certain substance/ and or/ object is.
And water isn`t an effective black body for UV/visible else these tanks would start boiling if 20 000 watts were converted into heat:
If the lights had been converted into heat, it would take only 4&1/2 days to bring these 6000 gallon tanks to the boiling point.
Every summer I fill up a "kiddie pool" which is only ~ 2000 gallons with tap water and it takes about 4 (stinking hot) days till it warms from 8 C to 20 C.
I`m not arguing that a tub full of black ink would not warm any quicker, but our oceans which are ~7/10th of the earth`s surface aren`t full with black ink either...and they would have to be to get the AGWarmist heat they claim the oceans "are hiding"
Technically, water both IS and ISN'T a good UV absorber if you define UV as down to 10nm.
So at sea level -- there's virtually no solar 10 nm UV to do anything. So you are fully correct it plays no part in the environment. For that matter -- there's virtually NO absorption ANYWHERE in the visible except the far RED, which is why you don't have poached fish in that large tank. (that and the heat leakage out of the observation windows.)
As far as UNnatural lighting and UV epoxies and Fish Lamps. I figured (maybe wrongly) that it would be the suspended silt and salt content that prevented re-radiation by supplying thermal conduction throughout the medium.. And that epoxy WAS curing by UV "heat" but that the compound similiarly had good conduction elements embedded in the goo.
So next spring (if it ever comes) -- while the kiddies are waiting for the pool to warm (if you call that warm
) --- try adding some silt and salt and tell me if that shaves a day or two off the waiting period...
