unit 2.2

• Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration
• Particles have more kinetic energy at higher temperatures
• Particles in liquids and gases move more quickly compared to particles in solids
• Hot liquids and gases diffuse faster than cold ones due to the increased movement of particles
• The higher the particle mass, the heavier particles are and hence will diffuse more slowly than lighter particles
• When perfume is sprayed out of the bottle, the volatile substances vaporize almost immediately