diffusion - The movement of particles from an area of higher concentration to an area of lower concentration, Kinetic energy - Energy of motion, thermodynamics - The study of heat, Thermal contraction - When particle motion decreases and causes the particles to occupy less volume, Thermal expansion - When particle motion increases and causes the particles to occupy more volume, temperature - The measure of average kinetic energy of the particles in a material, States of Matter - A distinct form in which matter can exist, Solid - The state of matter which has a fixed shape, mass, and volume, Liquid - A liquid is the state of matter that has a definite volume but takes the shape of its container., gas - A sample of matter with no fixed shape or fixed volume. It will expand to fill the container., Plasma - superheated matter – so hot that the electrons are ripped away from the atoms forming an ionized gas. It forms 99% of the visible universe., matter - any substance that has mass and takes up space, particle - a minute portion of matter (an atom or molecule),

Particles in Motion 1

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