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Silica glass: It is produced by heating pure sand to its melting point. Because of absence of refining agents, it is extremely difficult to get rid of all air-bubbles. Moreover, owing to the high viscosity of this glass at its working temperature, shaping is rather difficult. The final product is translucent its softening temperature is about 16500C. Its thermal expansion is lowest. If silica glass is heated for long periods, above its melting points, it finally becomes transparent and is then known as "clear silica glass". Glass of considerable light transmission properties, e.g. 1m thick of this material allow no less than 93% of light to pass. It is used mainly for chemical plants, chemical laboratory wares, electrical insulating materials in electrical heaters, furnaces etc.
is relation a=2r+ + 2r- correct for bcc
calculate the ratio of the fundamental frequency of HI and DI
Sharp line source: When the bandwidth of the primary radiation is low with respect to the profile of the analyte absorption, the given amount of analyte would absorb more radi
# what are supersaturated vapours
The maximum number of unpaired electron can be present in d orbitals are: (1) 1 (2) 3 (3) 5 (4) 7 Ans: 5
Stability of a nucleus and its binding energy
formula for producer gas
How i operate muffle furnace
Q. What do you mean by electro-magnetic radiation? In the untimely twentieth century scientists accepted the idea that an atom consisted of a massive positively charged nucleus
Q. Describe Molarity and Molality and what is the basic diffrence between Molarity and Molality? The concentration of a solution is usually expressed as molarity (i.e., M). The
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