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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
In a specific gravity test, 1.17 N of oven-dired soil was taken. The weight of pyknometer, soil and water was obtained as 6.51 N. The weight of pyknometer full of water alone was 5
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Q. Write short notes on Bricks? Bricks are an important construction material required in bulk Quantities for construction of walls both sub structure & super structure. For th
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