solid -> liquid = melting
liquid -> gas = evaporating
gas -> liquid = condensing
liquid -> solid = freezing
solid -> gas = sublimation
gas -> solid = deposition
interconversions = change of state
going from soild -> liquid -> gas requires energy input
heating ice makes its particles vibrate more vigorously. eventually the bonds between the solid particles are broken and it turns into water. if we heat the water, the particles get even more kinetic energy. some particles move so fast they have enough energy to break away from their neighbours and escape as a gas
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