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Why is the tungsten used almost exclusi...

Why is the tungsten used almost exclusively for filament of electric lamps? Explain.

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Because tungsten has a high melting point (`3380 ""^@C`), it does not melt at high temperature. It retains as much of heat generated, so that it becomes very hot and emits light without melting away.
Moreover, tungsten has high flexibility and low rate of evaporation at high temperature. That is the reason why tungsten is used as filament of electric lamps.
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