what is ultrasonic humidifier

An ultrasonic humidifier is a device that uses a vibrating element, such as a diaphragm, to create high-frequency sound vibrations that propel microscopic water droplets into the air. These droplets evaporate, adding humidity to the air in the room. Ultrasonic humidifiers are quieter than evaporative humidifiers, and they generally have no filter, which saves on yearly costs. They are also considered safer since there is no hot water present in the unit at any time, reducing the risk of scalding significantly. However, ultrasonic humidifiers tend to produce fine grayish dust that can settle around the room, since they have no filter to absorb minerals in the water.