How do room humidifiers work?

(Image source: Pexels)

Question from Rachel Ansem

Humidifiers use a range of mechanisms to force extra moisture into the air, increasing its humidity.
An evaporative humidifier employs a fan to run air through a damp filter soaked in a reservoir of water. As the dry air passes through, some of the water evaporates, adding moisture to the air. A  steam humidifier, meanwhile, boils water, releasing hot steam. 

Finally, inside an ultrasonic humidifier, a diaphragm vibrating at ultrasonic frequencies converts liquid water into tiny droplets, producing a cool mist. Using a humidifier can reduce the symptoms of respiratory conditions or dry skin.


Answered by Alexandra Cheung for Brain Dump in How It Works issue 99.

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