The Difference between a Nebulizer and a Diffuser

A Diffuser is any device which allows a liquid to evaporate thereby putting a scent into the surrounding environment. The process of diffusion is typically accomplished in 4 different ways:

(1) Heat---

by applying heat, either through burning a candle, or by using an electrically heated vaporizer, the increased temperature will cause the essential oil to evaporate into the air.
(2) Ventilation---

by utilizing a small fan to create airflow, evaporation is achieved when air passes over a wick or absorbent pad which holds the essential oil.
(3) Humidification---

by using water and essential oil mixed together, a mist can be formed which will fill the air. This mist is produced either by a fan, heat or ultrasonic waves of energy.
(4) Nebulization---

Is a process which forces the break down of essential oils into very tiny particles. It requires a high velocity, pressurized air stream and a specially designed jet nozzle. The rate of evaporation is highly accelerated and occurs almost instantly.
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So, a diffuser is simply any device that imparts a scent into the air by evaporation.
A nebulizer is a specific type of diffuser that uses the process of nebulization to achieve evaporation.
A common misunderstanding is that Nebulizers and Diffusers are thought to be the same thing but they are not.
The diffusion method you choose, will determine to a large degree, the amount of aroma and therapeutic benefit you receive from an essential oil.