Final answer:
The subject of this question is Chemistry. Argon, an odorless, colorless, unreactive gas, is used in most incandescent light bulbs to inhibit the vaporization of the tungsten filament and prolong the life of the bulb. Fluorescent tubes commonly contain a mixture of argon and mercury vapor.
Step-by-step explanation:
The subject of this question is Chemistry.
An odorless, colorless, unreactive gas used in most incandescent light bulbs is argon. Argon is preferred over nitrogen in light bulbs because of its lower heat conductivity and chemical inertness, which helps inhibit the vaporization of the tungsten filament and prolongs the life of the bulb.
Fluorescent tubes commonly contain a mixture of argon and mercury vapor.