why there is no increase in temperature during melting or boiling?
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This is why when you heat the substance up at this point you don't see an increase in temperature. It's called latent heat because it is 'hidden'. Once all of the forces between the particles have been overcome, the heat goes back into increasing the kinetic energy of the particles again, making the temperature rise
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During melting or boiling, the extra heat provided is used to break the intramolecular bonds between the substance. This is known as latent heat. Latent heat the heat which is used to break the bonds between molecules during a change in state of matter. Therefore there is no increase in temperature during melting or boiling.
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