What is the definiton of diffusion?

Answer 1

Quoting out of Kotz 6th edition Chem book, it says in the index:

"The gradual mixing of the molecules of two or more substances by random molecular motion."

In my own definition, is basically how things travel through-out another liquid/gas area. Think of putting food coloring in a glass of water, and it slowly creeps throughout the water. Same idea of diffusion.

Answer 2

The natural movement of a substance from an area of high concentration to low concentration

Answer 3

the movement of particles from a high point of concentration to an area of low concentration.