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Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling can be decreased by minimizing the development of internal stress by:
(1) Using refractory with high porosity, good thermal conductivity and low coefficient of expansion.
(2) Avoiding sudden temperature changes.
(3) Proper furnace design
An organic compound is found to contain 37.5% of C, 3.2% of H and 59.3% of F. The following pressure and volume data were obtained for 1.0g of this substance at 90 degrees celsius
Zinc has hcp structure. In a unit cell of zinc, the zinc atoms occupy 74% of volume of unit cell.
industrial applications-photochemistry
#question.Q1 What is wrong with each of the following attempts to write an electron configuration? Justify your answer with suitable explanation. (a) 1s22s3 (b) 1s22s22p23s2 (c) 1s
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Contact Printing In contact printing, the resist-coated silicon wafer is bring into physical contact with the glass photo mask. The wafer is held on a vacuum chuck, and the ent
Routine monitoring at a chemical process facility has detected fugitive emissions (leaks) of volatile organic compounds around several equipment valves, pump and compressor seals.
Ask questAmmonia is a gas for which reliable analytical methods are available to determine its concentration in other gases. To measure flow in a natural gas pipeline, pure ammonia
Positive and Negative Photo resist There are two types of photo resist: positive and negative. For positive resists, the resist is exposed with UV light where the underlying ma
Explain with sketch the process of "forging". Forging is the process by which metal is heated and is shaped by plastic deformation by suitably applying compressive force. Gener
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