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Oxide glasses fall into a range of n d from 1.4 to 2.0 and ν d from 20 to 90, with SiO 2 being the oxide glass with the highest contringency and lowest index. Fluoride glasses can go up to ν d >100 and nd<1.4, BeF 2 being the fluoride glass at the highest constringency and lowest index. Chalcogenide glasses have indexes exceeding 2, a large ...
Imperfections of the glass, such as bubbles, and in particular surface flaws, such as scratches, have a great effect on the strength of glass and decrease it even more than for other brittle materials. [2] [1] The chemical composition of the glass also impacts its tensile strength. [3]
Unless stated otherwise, the properties of fused silica (quartz glass) ... Refractive index n D [8] at 20 °C 1.518 1.473 1.531 1.650 1.459 1.608 1.7 Dispersion at 20 ...
A glasspack is a type of automobile muffler in which the exhaust gas passes straight through the center of the muffler. The basic design consists of one smaller tube centered inside a larger outer tube that is enlarged or swollen in the middle.
These weathering processes produce natural frosted glass. [1] Sea glass is used for decoration, most commonly in jewellery. "Beach glass" comes from fresh water and is often less frosted in appearance than sea glass. Sea glass takes 20–40 years, and sometimes as much as 100–200 years, to acquire its characteristic texture and shape. [2]
[4] [5] Such conventions include a constant cooling rate (20 kelvins per minute (36 °F/min)) [2] and a viscosity threshold of 10 12 Pa·s, among others. Upon cooling or heating through this glass-transition range, the material also exhibits a smooth step in the thermal-expansion coefficient and in the specific heat , with the location of these ...
A reversed halo sign is a central ground-glass opacity surrounded by denser consolidation. According to published criteria, the consolidation should form more than three-fourths of a circle and be at least 2 mm thick. [12] It is often suggestive of organizing pneumonia, [13] but is only seen in about 20% of individuals with this condition. [12]
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