Diffuser (sewage), an aerating device for sewage and industrial waste water treatment plants; a membrane with fine pores, eg. [ecotube diffuser], through which fine bubbles are generated by the supply of air through blowers
Diffuser (thermodynamics), a device that controls the characteristics of a fluid at the entrance to a thermodynamic open system
Diffuser (heat), a cooking item that can be placed above a stove heating element or burner to separate the cooking utensil from the heat source
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