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Give the properties and applications of Teflon.
Teflon: This is acquired by the polymerisation of tetrafloourethylene.
Properties:
1. This has good electrical, thermal and mechanical properties.
2. This can tolerate very, high temperature, without damage.
3. Dielectric constant does not modify with time, temperature and frequency.
4. Its insulation resistance is extremely high.
5. This is highly resistant to water absorption.
6. This melts at 3270C.
7. Its maximum useable temperature is 3000C.
Applications: It is used as dielectric material in capacitors. This is used as covering for conductors and cables that are needed to operate at high temperature. This is used as a base material for PCB's.
Atmospheric carbon dioxide is thought to be responsible for global warming. The table below contains data about the amount of Atmospheric CO 2 (in ppm) over the last fifty year
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If the atmosphere had a constant temperature of 20C and constant density, how high would the air extend above sea level? Would Mt. Everest, and 10km in elevation, protrude beyond
typesofhardness
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Requirement of potable water
20TPD Mg(oh)2 by brine
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