Reed diffusers are decorative items used to disperse fragrance throughout a space. They typically consist of a glass container with T-corks or stoppers and filled with scented liquid and several porous reeds or sticks. The fragrance oil travels up the reeds via capillary action and evaporates into the air, releasing a pleasant scent into the room.The viscosity of reed diffuser liquids can vary depending on the specific formulation and manufacturer. However, reed diffuser liquids typically have a viscosity ranging from low to medium. This viscosity is typically higher than that of water but lower than that of oils used in some other applications.