Question

Andy has left a bucket of smelly cheese porridge to cool down in the kitchen. a) Claire and Dagmar are sitting in the next room. Explain how the smell spreads to Claire's nose by diffusion. ...

Answer 1

Diffusion is the movement of particles from an area of high concentration to an area of low concentration, so if we have a perfum or a plate with a smelly food, this concentration of particles will, by diffusion, move to an area with a low concentration, which in this case is the air, and therefore by moving freely in the air, these particles will eventually reach our noses.