Question

What is the primary cause of diffusion?

Answer 1

diffusion is caused by the random collision of molecules in a solution due to entropy.

Answer 2

when you put a drop of dye into a cup of water, the molecules of dye start out colliding with eachother.

Answer 3

over time the dye gets evenly distributed throughout the water because that results in the least amount of collisions between dye molecules.

Answer 4

random molecules and atoms moving and colliding.

Answer 5

i like cheezitz answer. It can be summarized by saying that it's caused by brownian motion.