What happens inside the matter during the change of state?
NCERT Class IX
Sciences - Main Course Book
Chapter 1. Matter in our Surroundings
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When the temperature of the liquid reaches the boiling point,the additional heat energy is absorbed to overcome the intermolecular force of attraction and hence the intermolecular space decreases .
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In any state of matter, the particles are bonded with each other through certain intermolecular forces. These forces are quite strong in solid whereas weakest in gases. These states of matter can interconvert to each other by either application of pressure or temperature.
When the physical state of matter changes, the intermolecular forces between particles also changes that results in change in intermolecular distance between particles.
Like during melting of solid to liquid, intermolecular forces decreases that increase the distance between particles.
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