The filament breaks.
Filament of light bulbs are made up of Tungsten.
No, not in the filament. You are probably thinking of compact fluorescent light bulbs, which do contain mercury.
That is the filament. Electricity traveling through the filament heats it to the point of glowing brightly - that is the light bulbs "light".
It would no longer work. Light bulbs are usually under vacuum and if air gets in the filament blows.
tungsten
I have not had any problem obtaining incandescent light bulbs.
the filament is neither too thick nor too light
Domestic light bulbs are simply the light bulbs (usually of the filament type) used in the home.
The light bulbs do.
about 10% the filament light bulbs give off about 90% heat and 10% light
Tungsten
Assuming you're talking about light bulbs... the filament is made from Tungsten.