Question

when 1.5 voltage is applied to a piece tungsten filament it burns into ashes.but it doesn't happen so even at 230 voltage, when the filament is inside the bulb .why?​

Answer 1

Explanation:

The filament in a light bulb is housed in a sealed, oxygen-free chamber to prevent combustion. In the first light bulbs, all the air was sucked out of the bulb to create a near vacuum -- an area with no matter in it. ... In a modern light bulb, inert gases, typically argon, greatly reduce this loss of tungsten.

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