What is the assive process that is movement of a substance from an area of high to low concentration?

Answer 1

a passive process is any process that occurs without an input of energy. the process of a substance moving from a high area of concentration to an area of low concentration in order to obtain equilibrium is the process of diffusion, this requires no energy input therefore it is a passive process. Diffusion is a property of atoms. atoms move randomly but overall the net movement of atoms will always be to spread away from a high area of concentration. the reason for this can be explained by considering a perfume bottle. once opened the gas in a perfume bottle has the ability to escape, the reason the perfume leaves the bottle (this is just a theory) is because there are only so many ways that the atoms in the perfume bottle can be arranged but there is trillions of more ways that the atoms can be arranged outside of the bottle so probability tends towards the perfume escaping the bottle and spreading out in the room.

Answer 2

That process is called....diffusion. It can only be observed in fluids. (Gases count as fluids.)

Answer 3

Diffusion <-- though i believe i misspelled it.