What is crown glass

Hayley Australian. Natasha Australian. Veena Indian. Priya Indian. Neerja Indian. Zira US English. Oliver British. Wendy British. Fred US English. Tessa South African. How to say crown glass in sign language? Numerology Chaldean Numerology The numerical value of crown glass in Chaldean Numerology is: 9 Pythagorean Numerology The numerical value of crown glass in Pythagorean Numerology is: 5.

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Note: the article keyword search field and some other of the site's functionality would require Javascript, which however is turned off in your browser. Crown glasses are optical glasses with an Abbe number above 55 or above 50 — there is no general agreement on that limit. A high Abbe number indicates weak chromatic dispersion and tentatively a low refractive index, but not always lower than for flint glasses.

The term crown glass does not imply a certain chemical composition. Tentatively, crown glasses contain lower amounts of heavy metals e. Often they are soda—lime glasses silicate glasses or phosphate glasses. Their mass density is comparatively low. Crown glasses have a larger band gap energy than flint glasses, leading to a shorter-wavelength UV absorption edge. Their parasitic absorption and scattering losses can be fairly low.

The common system of names for glass types uses a combination of one or more letters with a number. The letters indicate the general type of glass, e. There are various more closely specified crown glass types, see the following table:. Homophones, Homographs, and Homonyms The same, but different.

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