What is Diffusion? What does it mean to diffuse? To Spread out!—Kind of Movement of molecules from HIGH concentration to LOW concentration Some particles can diffuse through the air, Some particles can diffuse through a cell membrane

Diffusion Movement of molecules from HIGH concentration to LOW concentration Movement occurs until Equilibrium is reached Equilibrium: The state at which there is not NET flow of molecules Equal concentrations on both sides

Gradient What is a Gradient? Gradient: The differences in concentrations between 2 areas 90 10 45 55 LARGER the Gradient, faster particles move across membrane

Osmosis Movement of water from high concentration to low concentration THROUGH A MEMBRANE

What effects the rate of diffusion? Movement effected by gradient, temperature, pH, and charge.