Tungsten in light bulbs.

... Tungsten in light bulbs How does a light bulb work? Light bulbs have a very simple structure. At the bottom, they have two metal contacts, which connect to the ends of an electrical circuit. The metal contacts are attached to two stiff wires, which are attached to a thin metal filament. The filament sits in the middle of the bulb, held up by a two supporting wires connected to a small glass stand. Inside the glass bulb is the wires and filament, also an inert gas, such as argon. (An inert gas is a gas where their atoms outermost shells are completely filled with electrons, and so making them un-reactive). When the bulb is hooked up to a power supply, an electric current flows from one contact to the other, through the wires and the filament. The electrons move freely because the conductor is solid, this means that the electrons are not tightly

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