Smells are just chemicals, and the speed that chemicals diffuse in the air is predicted by Graham’s Law when you compare two gases. To help understand this concept, use oxygen as your standard gas. “The ratio of the speed of diffusion on the smell compared to oxygen is equal to the square root of the inverse of the mass of the oxygen molecule divided by the mass of the molecule of the smell.” After the calculations are complete, you will find that the speed of the smell is about 1/3rd of the average speed of the molecules of oxygen in the air.
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