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[44] [59] Although generally transparent to visible light, glasses may be opaque to other wavelengths of light. While silicate glasses are generally opaque to infrared wavelengths with a transmission cut-off at 4 μm, heavy-metal fluoride and chalcogenide glasses are transparent to infrared wavelengths of 7 to 18 μm. [60]
Any transparent cup, regardless of actual composition, is more likely to be called a "glass"; therefore, while a flat-bottomed cup made of paper is a "paper cup", a transparent one of very similar shape, is likely to be called a "tumbler", or one of many terms for glasses, instead.
Mosaic glass cups have also been found at Teppe Hasanlu and Marlik Tepe in northern Iran, dating to the Iron Age. These cups resemble ones from Mesopotamia, as do cups found in Susa during the late Elamite period. Glass tubes containing kohl have also been found in Iranian, belonging to the Achaemenid period. During this time, glass vessels ...
Several glasses are utilized in transparent armor, such as normal plate glass (soda-lime-silica), borosilicate glasses, and fused silica. Plate glass has been the most common glass used due to its low cost, but greater requirements for the optical properties and ballistic performance have generated the need for new materials.
The cup will usually have a scale marked in cups and fractions of a cup, and often with fluid measure and weight of a selection of dry foodstuffs. Measuring cups may be made of plastic, glass, or metal. Transparent (or translucent) cups can be read from an external scale; metal ones only from a dipstick or scale marked on the inside.
Borosilicate glass is a type of transparent glass that is composed of boron oxide and silica, its main feature is a low coefficient of thermal expansion making it more resistant to thermal shock than most other glasses. [10] Quartz glass can withstand very high temperatures and is transparent in certain parts of the electromagnetic spectrum.
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