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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'.
Chain Surveying: In the chain surveying, you have studied the basics of chain surveying. In chain surveying, various equipment and instruments are used for measuring distances
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Estimate the ground level NO concentration: a. Directly downwind at a distance of 2 km b. At the point downwind where NO is maximum c. At a point located 2 km downwind and 0.1 km
Soil plug in marine piling system of steel tubular pile with reinforced concrete infill At the time of initial driving process, open-ended steel piles are driven through the s
LIME It is significant binding material utilized in building construction. Lime has been utilized as the material of construction from ancient time. While it is mixed with san
Loss of prestress due to elastic shortening At the transfer of prestress, tensile stresses of tendons are transferred to concretc in the form of compressive stresses. Due to t
The thiclcness of the normally consolidated soft clay layer is 6 m. The natural water content is 31 percent. The specific gravity of the soil being 2.68 with a liquid limit of 4
Explain the Tertiary Treatment for Wastewater Tertiary Treatment: in cases where secondary treatment is not adequate (particularly if the discharges are into a sensitive water
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give the two aspects of honesty& explain
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