What's the difference between a Nebulizer and a Diffuser?
What is best for therapeutic benefit?By Jennifer Stephens
LRRT
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.
- 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.
For example, if we use heat to evaporate the essential oil, it will gently
produce a scent and fill the room nicely. However, heat has 2 drawbacks. First, it tends to alter the
chemical composition of the essential oil which can destroy it’s purity and therapeutic value. Second, while
heat does produce a nice aroma, it may not be therapeutically useful. The size and availability of breathable
molecules are mostly filtered out by the nose hairs and nasal cavity. (see EGAN for more in-depth details)
Ventilation offers an economical and simple way to provide evaporation. Since there is no heat
involved, the chemical composition of the essential oil remains intact. But again, the size and availability
of breathable molecules compromises therapeutic benefits. Ventilation is a good way to scent a room as long
as it’s not too large.
Humidification has many health benefits, but is the least effective way to provide aroma because
the majority of the mist is water vapor. Using a humidifier may produce a nice scent, but has very limited
healing capacity since the amount of essential oil is so small.
Nebulization is absolutely the best way to provide both aroma and therapeutic healing value
with essential oils. It does not alter the chemical composition of the oils. It breaks down pure essential
oil molecules without separation of the mixture. It produces a particle size small enough for the lungs and
body to absorb them rapidly.
Its only drawback is expense—it costs more to create a steady pressurized air flow
than to create heat or rotate a fan. However, no method of diffusing is as effective in preserving the
natural healing qualities of essential oils.
Breaking down the oil in its natural state maintains purity and provides the most
effective bioavailable therapy to the cells of the human body. Nebulization is the only method of diffusion
that creates particles small enough to reach the deep part of the lungs.
A particles depth of penetration into the respiratory tract varies inversely with
its size.
Particles between 5 and 20 microns will only reach the upper airway: nose, larynx,
trachea.
Particles between 2 and 5 microns will reach the lower airways.
Particles between 1 and 3 microns will reach the alveolar region: (deep part of
the lung)
(see reference to EGAN for more details)
In conclusion, if all you want to do is provide a pleasant scent to your environment, any
diffuser will work fine. But if you want to use essential oils for their maximum healing qualities and pure
therapeutic benefit, only a nebulizer will do the job correctly and effectively.
This is why doctors and respiratory professionals prescribe the use of a
nebulizer to administer inhalants of a medicinal or therapeutic nature.
Jennifer Stephens LRRT
(Licensed and Registered Respiratory Therapist)
References: EGAN’s Fundamentals of Respiratory Care-- Seventh edition--copyright 1999 by Mosby, INC.
Page 158 (Nasal Cavity) and pages 684-685 (Particle Size)
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