why do they wear black in the desert


1. Hutchinson, J. C. D. Brown, C. D. J. appl. Physiol. 26, 454в464 (1969). 2. Cena, K. Monteith, J. L. Proc. R. Soc. 199, 377в393 (1975). 3. Walsberg, G. E. ,
Campbell, G. S. King, J. R. J. comp. Physiol. 126, 211в212 (1978). 4. Finch, V. A. J. thermal Biol. 1, 143в148 (1976). 5. Finch, V. A. , Dmi\’el, R. , Boxman, R. , Shkolnik, A. Taylor, C. R. Physiol. Zool. (in the press). 6. Swinbank, W. C. Q. JI R. met. Soc. 89, 339в348 (1963). 7. Dubois, D. Dubois, E. F. Arch. intern Med. 15, 868в881 (1915). 8. Belding, H. S. , Russell, H. D. , Darling, R. C. Folk, G. E. J. Physiol. 149, 223в239 (1947). 9. Breckenridge, J. R. , Pratt, R. L. Woodcock, A. H. Fedn Prod. 19, 178 (1960). It s just a generalized description Sim. All fabrics will be transparent if thin enough, but black materials less than white, due to the way they can absorb and transform the visible radiation to heat.

Then white thick cotton is better than black thick cotton. Not if you want the convection, then black should be what you aim for. White reflects light of all wavelengths whilst a red cloth absorbs all other colors than red better, how good it absorbs those other will be seen as how red the cloth will be to you, also depending on the light-source of course. Black also reflects all colors, just like white, but as it absorbs so much of them the net effect becomes a black. That I didn t mention it before was because I was trying to keep to what the main question was why do people wear black in the desert.

But you re right, it bears on the question under the caption. It also have to do with the type of eyes we have. They don t separate by wavelength only, they re not built on that principle it seems. Our brain take the information received from the eyes which it then interpret. That s the reason why yellow can be seen both with the frequency reflected being yellow or be perceived as being the same with a equal blend of red and green, both saying yellow to us. The retina contains three types of color receptor cells, or cones. One type, relatively distinct from the other two, is most responsive to light that we perceive as violet, with wavelengths around 420 nm; cones of this type are sometimes called short-wavelength cones, S cones, or blue cones.

The other two types are closely related genetically and chemically. One of them, sometimes called long-wavelength cones, L cones, or red cones, is most sensitive to light we perceive as greenish yellow, with wavelengths around 564 nm; the other type, known as middle-wavelength cones, M cones, or green cones is most sensitive to light perceived as green, with wavelengths around 534 nm. Light, no matter how complex its composition of wavelengths, is reduced to three color components by the eye. For each location in the visual field, the three types of cones yield three signals based on the extent to which each is stimulated. These amounts of stimulation are sometimes called tristimulus values.

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