permanent - existing all of the time, particle - a very small piece of something, solid - a substance that is neither a gas or a liquid, gas - a substance that is neither a solid or a liquid, vapour - small drops of liquid in the air, evaporate - turn from liquid into vapour, condense - turn from vapour into liquid, melt - to become a liquid as a result of heating, matter - the physical substance that everything is made up of, state - the physical condition that a thing is in, volume - the amount of space that an object or substance fills,

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