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.
For more science and technology articles, pick up the latest copy of How It Works from all good retailers or from our website now. If you have a tablet or smartphone, you can also download the digital version onto your iOS or Android device. To make sure you never miss an issue of How It Works magazine, subscribe today!