Question

a What is diffusion? b Use the idea of diffusion to
explain how the smell of perfume travels.

Answer 1

Answer: Diffusion in gases

Explanation:  Diffusion is driven by differences in concentration. When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions.

Answer 2

Answer:

Diffusion is the net movement of anything (for example, atom, ions, molecules) from a region of higher concentration to a region of lower concentration. 

Explanation:

The molecule in a gas are arranged far away from each other . A gas has a tendency to occupy the entire space available to it and its molecule are always in its random motion. Due to high speed of particles n large space between them gases show the property of diffusing very fast into other gases .So the smell of perfume is carrried few yards away.