In diffusion, substances move from where to where?

In diffusion, substances move from where to where?

• A. From low concentration to high concentration
• B. From high concentration to low concentration
• C. In a random direction
• D. Only in fluids

Answer: (B)

Diffusion is the net movement of particles caused by their random motion, proceeding down a concentration gradient. This means from regions with a higher concentration to regions with a lower concentration, as the substances spread out until concentrations are more even. Individual molecules move in all directions, but there are more particles crossing from the crowded area outward, so the overall flow is toward the less concentrated region. Moving from low to high concentration would require energy and isn’t diffusion. Diffusion occurs in gases, liquids, and solids, not just in fluids. A familiar example is perfume dispersing in a room, starting strongest near the source and fading as it spreads outward.

Diffusion is the net movement of particles caused by their random motion, proceeding down a concentration gradient. This means from regions with a higher concentration to regions with a lower concentration, as the substances spread out until concentrations are more even. Individual molecules move in all directions, but there are more particles crossing from the crowded area outward, so the overall flow is toward the less concentrated region. Moving from low to high concentration would require energy and isn’t diffusion. Diffusion occurs in gases, liquids, and solids, not just in fluids. A familiar example is perfume dispersing in a room, starting strongest near the source and fading as it spreads outward.