How does an electric fan help you feel cooler?
AnswerIt helps sweat evaporate faster from your skin
Moving air speeds evaporation from skin and carries away warm air near the body.
Science · Facts & stats
Fan facts & stats
7 fact-checked facts about fans and moving air, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
Inside a computer, a fan is most often used to cool which part?
AnswerThe processor
Processors produce heat, so a fan and heat sink carry it away.
Going deeper
Running a fan in a closed, empty room does what to the air temperature?
AnswerRaises it slightly
The motor's energy ends up as heat, so the room warms a little; fans cool people, not rooms.
Why are fan blades set at an angle?
AnswerSo they push air as they spin
Tilted blades act like small wings, pushing air forward as they rotate.
What does RPM measure on a fan?
AnswerHow fast the blades spin
RPM means revolutions per minute, the number of full turns the blades make each minute.
Expert level
In the US, fan airflow is commonly rated in which unit?
AnswerCFM
CFM means cubic feet per minute, the volume of air a fan moves.
The punkah, a large swinging fan pulled by a rope, was traditionally used in which country?
AnswerIndia
The punkah was a cloth or wooden fan hung from the ceiling and swung by hand in India.
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