what is properties of tungston make it suitable for being used as a filament?
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Pure Tungsten is one such element used for making bulb filament as it has the highest melting point of 3695K. Also, its vapour pressure is very low and has great tensile strength out of all the metals used to conduct heat and electricity.
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Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not melt even when a large amount of heat is produced due to passage of current through the filament (via heating effect of current).
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