do all substances change from solid to liquid and liquid to gas on heating ? explain
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No, substances like napthalene doesnot under goes into liquid state. It directly changes into gaseous state. Those substances are called sublimable substances.
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it is not necessary that a substance will convert into solid to liquid or liquid to gas . there is also some substances which convert from solid to gas directly on heating. these all things depend upon the intermolecular attraction b/w the substance if is stronger enough, as in solid ,then it will first convert into liquid then on further heating into gas.
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