Ultrasonic diffusers are devices that use high-frequency sound waves to break down essential oils into tiny particles and disperse them into the air. They are often used for aromatherapy or to create a pleasant scent in a room. Full definition
We believe that an aromatherapy diffuser is an ideal way to administer most of our pure essential oils, and offer a variety of ultrasonic diffusers for this purpose. (floracopeia.com)
Because I have a few cool mist ultrasonic diffusers from Young Living, I thought it would be neat to try out a nebulizing diffuser that -LSB-...] (juicygreenmom.ca)
However, since they are made of glass, nebulizers don't often come in the same fun design styles as ultrasonic diffusers. (mindbodygreen.com)