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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.
Wiktionary (0.00 / 0 votes) Rate this definition: diffuser (Noun). Any person or thing that diffuses. diffuser (Noun). A device designed to diffuse a scent efficiently.diffuser (Noun). Any device that or spreads out or scatters light, making the light appear softer.iktionary (0.00 / 0 votes) Rate this definition: diffuser (Noun). Any person or thing that diffuses. diffuser (Noun). A device designed to diffuse a scent efficiently.