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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
1 Cold Air Diffuser â A cold air diffuser uses room-temperature air to blow the oil into a nebulizer where it is vaporized. 2  This diffuser can diffuse quickly and efficiently; however it is noisy and can be a little messy! 3  It also can not effectively diffuse heavier, thicker oils and it is hard to clean.