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Passive diffusers use natural evaporation or absorption to release essential oils into the surrounding air. They typically use porous materials such as terracotta, clay, wood, or lava rock, which absorb the oils, then gradually release their scent over time. Unlike active diffusers, which use electricity, ultrasonic vibrations, or fans to disperse oils, passive diffusers operate silently and require no power source, making them eco-friendly and low maintenance. Choose a favorite from our selection today!