Device for dispensing a volatile active substance, comprising a container (3) that is at least partially restricted by a transpiration layer (2). The container (3) is at least partially filled with a liquid mixture comprising at least one volatile liquid substance and an auxiliary liquid. The liquid mixture of the liquid active substance and the auxiliary liquid is capable of forming an azeotrope. The transpiration layer (2) is impermeable for the liquid phase of the liquid mixture, but permeable to its gaseous phase, however.
