Particle - The smallest unit of matter, either an atom or a molecule., Atom - The basic unit that makes up an element., Molecule - Two or more atoms chemically joined together., Change of state - The conversion of a substance from one form to another., Brownian motion - The random movement of particles in a liquid or a gas., Diffusion - The random movement of particles down a concentration gradient. (from an area of high to low), Expansion - It gets a little bigger, this happens because the particles move faster and spread out., Conduction - Is a process by which heat energy is transmitted through collisions between neighbouring atoms or molecules., Density - Is a measure of how heavy something is compared to its size. It is the mass per unit volume of any object, Compress - is a force that squeezes something together, forcing the molecules closer together., Pressure  - is defined to be the amount of force exerted per area on a surface.,

Particle Theory

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