Particle, A small object, such as an atom or molecule, that can’t be seen with a microscope, Diffusion, The movement of particles from an area of high concentration to an area of low concentration, Membrane, A barrier that controls the movement of particles by allowing particles of certain sizes through. Found in cells, Equilibrium, This occurs when the movement of particles is the same on either side of the membrane, Kinetic energy, The energy required for particles to move - also known as movement energy, Concentration, The amount of particles present in an area or volume.

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