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An ultrasonic diffuser is an aromatherapy diffuser that uses electricity to disperse essential oils into the air. They break the essential oil particles down into their base molecules. These molecules are negatively charged so they disperse by attaching the positively charged molecules in your home. Ultrasonic diffusers use water as a transference mechanism but do not rely on steam. Instead, the oil sits on top of the water and ultrasonic vibrations are created to agitate the water causing the separation of the oil molecules and releasing the negative particles into the air with a fine mist.