What is Your Choose Between Ultrasonic and Nebulizer Diffusers?

Ultrasonic and Nebulizer Diffusers Compared

Are you interested in using an aroma diffuser but want to know more about how it works, its pros and cons, to make the right choice?

In this short article, we provide you with the essential information to better understand how it works, comparing mainly ultrasonic diffusers, which are the most used, and nebulizers.

Diffusers are small devices that spread a pure fragrance of essential oils into the air. They can also be used without oils such as small humidifiers.

Very easy to use and maintain, they are essential for inhaling perfumed air, cleaner, and with the beneficial properties of essential oils.

There are mainly two types of electric diffusers: ultrasonic and nebulizers.

We recommend reading: 3 Reasons to choose a nebulizing diffuser.

What is an ultrasonic diffuser?

It is a device that uses an electric current to generate a fast vibration of a ceramic disk inserted in the water container.

This vibration creates very small waves in the water, which fragment essential oils into micro-particles, lighter, and free to release around.

An added benefit linked to ultrasonic diffusers is that the micro molecules created by the vibrations have a negative charge and are therefore able to attract harmful particles into the environment and purify the air.
There is no heat, no water is heated, and 6-10 drops are enough to spread the aroma for hours.

How does it work?

  • Fill the container with water by adding a few drops of essential oils
  • The diffuser turns on, and the fast vibrations created by the ceramic disk begin to stir the water slightly, creating small waves.
  • These small waves fragment the essential oils diluted into micro-particles, which volatize together with the water particles.
  • This separation is what is perceived as a slight haze that spreads into the environment.
  • One of the effects of this mechanical agitation is also a slight negative electrostatic charge of the volatile molecules.
  • The negative charge attracts other positively charged molecules such as free radicals scattered in the air we breathe, neutralizing them.

What is a Nebulizer?

They, too, are devices that use electric current to generate a breakdown of the aromatic particles and facilitate their diffusion.

Unlike other diffusers, Nebulizers do not require water. These diffuse a pure and concentrated fragrance of only pure essential oils. However, consumption is much faster, and it is better to use a timer to prevent the oil from consuming too quickly.

The principle is the same as for ultrasonic diffusers, that is, a microscopic “breaking” of the bonds that hold together the aromatic molecules, which consequently will disperse more easily in the room.

How does it work?

  • Scientifically, essential aroma nebulizers exploit the “Bernoulli principle” (the one that makes planes fly or sailboats go forward)
  • An air current is conveyed through a small tube. The speed of the air increases while the pressure decreases
  • The difference in pressure creates a kind of suction that allows the essential oil, inside a glass channel, to rise upwards.
  • As the oil rises, a jet of pressurized air blows towards the oil, causing it to split into smaller volatile particles, which will fill another glass container.
  • These extremely volatile particles continue to rise up to exit the glass container, thus being released into the surrounding air.
  • The particles that remain in the glass container will start the cycle again until all the oil is used up.


Ultrasonic diffusers

  • It is used with a few drops of essential oil diluted in water.
  • Softer and less intense aroma
  • Purifier
  • Night light
  • Aroma diffusion area: Medium
  • Use of modest quantities of essential oils and long working times
  • Mainly made of plastic, resistant but must be cleaned to avoid mold.
  • Easy to use and clean. It works well regardless of the viscosity of the essential oil

Nebulizer diffusers

  • It is used without water, only undiluted pure essential oils.
  • Stronger and more marked aroma.
  • Aroma diffusion area: wide.
  • Greater use of essential oils for shorter working times.
  • Made of glass, wood, and ceramic. It is necessary to use it with some precautions in the presence of children and pets.
  • Frequent cleaning is required and cannot be used with particularly thick and viscous oils.

You might also like – The best places to put a diffuser.