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Materials that allow the transmission of light waves through them are called optically transparent. Chemically pure (undoped) window glass and clean river or spring water are prime examples of this. Materials that do not allow the transmission of any light wave frequencies are called opaque. Such substances may have a chemical composition which ...
An opaque substance transmits no light, and therefore reflects, scatters, or absorbs all of it. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of cesia in an order system with three variables, including opacity, transparency and ...
Water (43 C, 158 P) Pages in category "Transparent materials" The following 45 pages are in this category, out of 45 total.
[106] [107] Examples include LiCl:RH 2 O (a solution of lithium chloride salt and water molecules) in the composition range 4<R<8. [ 108 ] sugar glass , [ 109 ] or Ca 0.4 K 0.6 (NO 3 ) 1.4 . [ 110 ] Glass electrolytes in the form of Ba-doped Li-glass and Ba-doped Na-glass have been proposed as solutions to problems identified with organic ...
The chalcedony was ground to powder form then mixed with water and animal fat or tree resin or gum. [ 16 ] In the Bronze Age chalcedony was in use in the Mediterranean region; for example, on Minoan Crete at the Palace of Knossos , chalcedony seals have been recovered dating to circa 1800 BC . [ 17 ]
The size, distribution, and density of the particles controls the overall effect; which may range from mild opalization to opaque white. Some glasses are somewhat more blue from the side and somewhat red-orange in pass-through light. The particles are produced by the addition of opacifiers to the molten glass. Some opacifiers can be insoluble ...
Few materials do not cause diffuse reflection: among these are metals, which do not allow light to enter; gases, liquids, glass, and transparent plastics (which have a liquid-like amorphous microscopic structure); single crystals, such as some gems or a salt crystal; and some very special materials, such as the tissues which make the cornea and ...
There are also weaker dependencies on temperature, pressure/stress, etc., as well on precise material compositions (presence of dopants, etc.); for many materials and typical conditions, however, these variations are at the percent level or less. Thus, it's especially important to cite the source for an index measurement if precision is required.