The process of movement of molecules from higher concentration to lower concentration is called

This question addresses a fundamental concept in chemistry and biology concerning molecular movement. Diffusion is defined as the net movement of particles from an area of higher concentration to an area of lower concentration. This passive process occurs due to the random kinetic energy of molecules and continues until an equilibrium state is reached. It is vital for many biological processes, such as gas exchange in the lungs and nutrient absorption.

• Evaporation is the process of a liquid turning into a gas from its surface.
• Sublimation is the direct transition from solid to gas.
• Condensation is the process of a gas turning into a liquid.

These distractors describe phase changes, which are distinct from the movement of molecules down a concentration gradient.