What is the reason that the temperature of a substance does not rise while it is in the act of melting, even if heat is added to it?
- Melting will not occur until the latent heat of vaporisation has been supplied, this prevents a rise in temperature until all the solid has melted.
- The added heat energy is used to increase the vibrational and rotational kinetic energies rather than the temperature (i.e. translational kinetic energy) of the particles
- The presence of colder unmelted particles alongside particles that are in liquid form causes their temperature to remain low.
- Any energy added to the substance is used to break the bonds that hold the particles into the solid form so does not contribute to a temperature rise.
Medicine
D: Once the bonds between the adjacent particles of a solid have been broken, they are free to move about and the particles can increase their kinetic energy, that is, rise in temperature.
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