Melting - is the process of going from solid to liquid., Boiling (or evaporation) - is the process of going from liquid to gas., Freezing - is the process of going from liquid to solid., Condensation - is the process of going from gas to liquid., Occasionally (e.g. for carbon dioxide) - ) we can go directly from solid to gas in a process called sublimation., Matter is made up of - particles that are constantly moving, Solid particles - have the least amount of energy and gas particles have the greatest amount of energy, The temperature of a substance is - a measure of the average kinetic energy of the particles., A change in phase may occur - when the energy of the particles is changed., There are spaces between - the particles of matter.,

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