Thermodynamics/Cooling Curve

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Question
When a cooled object is cooled to its melting ( freezing ) or boiling point, it will experience a constant temperature for a specific time interval. This is because the heat released to the surroundings by the object is exactly balanced by the heat liberated as particles attract to one another during the formation of bonds. My question is, why will heat energy be released during the formation of bonds between particles? Do reply at your earliest convenience. Thanks.

Regards,
Jack.

Answer
molecules in a liquid have more kinetic energy than molecules in a solid.  at the transition point (freezing), you have to remove heat from all of the molecules so that they all become solid before you can remove heat and lower the temperature further.  the same deal works at the boiling point.  

Thermodynamics

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Richard J. Raridon

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Any in general physics category

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Have taught general physics several years

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MA in physics

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