Why do bathrooms have exhaust fans?
AnswerTo remove moist air and help prevent mold
Exhaust fans pull out humid air from showers and baths, reducing condensation and mold growth.
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Bathroom facts & stats
8 fact-checked facts about bathrooms, each with the reason behind it. 4 more are in today's round and join this page after it closes.
The basics
What does "WC" stand for on signs for toilets?
AnswerWater closet
WC stands for water closet, an older term for a room with a flushing toilet.
Going deeper
What does the U-shaped trap under a sink do?
AnswerHolds water that blocks sewer gases
The trap keeps a small plug of water in the pipe, stopping sewer gases from rising into the room.
What does a GFCI outlet near a sink do?
AnswerCuts power quickly if current leaks to ground
A ground fault circuit interrupter shuts off power in a fraction of a second when it detects a current leak.
Most toilets are made from which material?
AnswerVitreous china
Toilets are usually vitreous china, a glazed ceramic fired at high heat to be hard and non-porous.
The chalky limescale around taps is mostly deposits of which minerals?
AnswerCalcium and magnesium
Hard water carries dissolved calcium and magnesium, which leave limescale as water evaporates.
Expert level
In an ancient Roman bathhouse, what was the caldarium?
AnswerThe hot bath room
The caldarium was the hot room; the tepidarium was warm and the frigidarium was cold.
What is the purpose of a vent stack in household plumbing?
AnswerIt lets air into drain pipes so water flows and traps stay full
Vent pipes let air into the drain system so draining water does not suck traps dry.
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