Which of the following best describes the process of diffusion?
To determine which of the following best describes the process of diffusion, we first need to understand what diffusion is. Diffusion is the net movement of particles (molecules, ions, or other substances) from an area of higher concentration to an area of lower concentration, as a result of their random motion.
Now, let's examine the options to find the best description:
Option 1: The movement of particles from an area of lower concentration to an area of higher concentration.
This is not an accurate description of diffusion because diffusion occurs from an area of higher concentration to an area of lower concentration.
Option 2: The movement of particles due to external force or pressure.
This is not a characteristic of diffusion. Diffusion occurs solely due to the random motion of particles, not external forces.
Option 3: The movement of particles driven by a concentration gradient.
This is the most accurate description of diffusion. Diffusion occurs because of the difference in concentration between two areas, and particles move along the concentration gradient.
Option 4: The transport of particles through a selective membrane.
This is not a general description of diffusion. While there are specific types of diffusion, such as facilitated diffusion, that occur through membranes, diffusion is not limited to this specific scenario.
Therefore, the best description of the process of diffusion is: "The movement of particles driven by a concentration gradient" (Option 3).