A very tiny object such as an atom or molecule, too small to be seen with a microscope. - Particle, A way to think about how substances behave in terms of small, moving particles. - Particle model, Movement of particles from an area of high concentration to an area of low concentration. - Diffusion, Caused by collisions of particles with the walls of a container. - Gas pressure, How much matter there is in a particular volume, or how close the particles are. - Density, Change from liquid to gas at the surface of a liquid, at any temperature. - Evaporate , Change from liquid to a gas of all the liquid when the temperature reaches boiling point. - Boil, Change of state from gas to liquid when the temperature drops to the boiling point. - Condense, Change from solid to liquid when the temperature rises to the melting point - Melt, Change from liquid to a solid when the temperature drops to the melting point. - Freeze, Change from a solid directly into a gas. - Sublime,

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