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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