Context: Incandescent light bulbs consist of an air-tight glass enclosure (the envelope, or bulb) with a filament of tungsten wire inside the bulb, through which an electric current is passed. Contact wires and a base with two (or more) conductors provide electrical connections to the filament. Incandescent light bulbs usually contain a stem or glass mount anchored to the bulb's base that allows the electrical contacts to run through the envelope without air or gas leaks. Small wires embedded in the stem in turn support the filament and its lead wires.

Question: What is the name of the air-tight glass enclosure in an incandescent bulb?
Answer: the envelope

Question: What is the filament made of?
Answer: tungsten wire

Question: How many conductors are present in the bulb's base?
Answer: two (or more)

Question: What prevents air or gas leaks from a light bulb?
Answer: a stem or glass mount anchored to the bulb's base

Question: What function do small wires in a light bulb's stem perform?
Answer: Small wires embedded in the stem in turn support the filament and its lead wires

Question: What consists of a non-air-tight glass enclosure?
Answer: Unanswerable

Question: What is the filament not made of?
Answer: Unanswerable

Question: What allows air or gas leaks in the bulb's base?
Answer: Unanswerable

Question: What does not support the filament and its lead wires?
Answer: Unanswerable

Question: What has four conductors that provide electrical connections to the filament?
Answer: Unanswerable