Found This Helpful. Comstock/Comstock/Getty Images. Temperature can affect both the structure of a molecule and how it interacts with surrounding molecules. Heating some molecules, particularly large, biological molecules such as proteins or nucleic acids, will cause them to change shape or even to break up.
The air comes through the diffusers in much larger velocities and different temperatures than the ones tolerated in the space. Due to diffusion, the velocity and the temperature differences are gradually decreased until they reach the tolerable limits.
Like ceramic and reed diffusers, electric fan diffusers expose essential oils to air without heat. Drops of the essential oil are added to a pad or to water. An electric fan in the diffuser blows air at the pad or water, causing the oils to disperse into the air.