Tungsten metal is used to make a solenoid type coil in an electric bulb.
give scientific reason
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Answered by
37
Light bulbs glows when electricity is passed through the filament.
The filament must have these following properties-
High melting point
Tungsten has melting point of 3422C so it doesn't melt when current is passed it doesn't melt.
Tungsten apart from having high melting point also has high tensile strength. Tensile strength determines how strongly it can be molded into thin wires. Tungsten has low vapor pressure and hence will not produce tungsten vapors when heated. It has low thermal expansion coefficient and hence will not change its shape and structure when heated.
The filament must have these following properties-
High melting point
Tungsten has melting point of 3422C so it doesn't melt when current is passed it doesn't melt.
Tungsten apart from having high melting point also has high tensile strength. Tensile strength determines how strongly it can be molded into thin wires. Tungsten has low vapor pressure and hence will not produce tungsten vapors when heated. It has low thermal expansion coefficient and hence will not change its shape and structure when heated.
Answered by
12
Tungsten wire is one of the few substance that conduct sufficient electricity to react 7000 degree Celsius while maintaining enough strength to last thousand hours and survive bumps and vibration that's why tungsten is used to make a solenoid type of coil in electric bulb
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