Final answer:
The rate of diffusion depends on factors such as the concentration gradient, surface area of the membrane, membrane permeability, and temperature. A steeper concentration gradient facilitates faster diffusion, while heavier molecule mass and thicker membranes slow it down.
Step-by-step explanation:
The rate of diffusion is dependent upon the surface area and permeability of the membrane, temperature, and steepness of the concentration gradient. Several factors influence diffusion rate, including concentration gradient, surface area, and membrane permeability. With a steeper concentration gradient, diffusion occurs more rapidly. On the other hand, diffusion slows down as the distribution of material approaches dynamic equilibrium. Additionally, an increased surface area enhances diffusion rate, while a thicker membrane impedes it. Temperature also plays a role, with higher temperatures generally increasing the diffusion rate due to the increased movement of molecules. Each substance diffuses according to its specific concentration gradient. Factors such as the mass of diffusing molecules affect the speed at which diffusion happens, with heavier molecules generally diffusing more slowly.