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It takes energy to alter temperature, and it also takes energy to change state, at least in the direction of more energetic states, which is to say, to melt a solid or to vaporize a liquid. If energy is being consumed by the change of state itself, then there is no energy available to change the temperature. So the temperature remains constant. In practice, this means for example that things boil at the boiling point. Boiling water is always exactly 100o Celsius. It can get no hotter until it is all boiled. The steam, of course, can then get hotter.

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Q: Why do changes of state happen at a constant temperature?
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What happens to a temperature of a substance while a changing of state occurs?

As a substance changes state, the temperature remains constant.


When the physical state of a substance changes during a phase what happens to the temperature of the system?

The temperature remain constant during a change of phase.


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No. During a phase change the temperature is constant until the phase change is complete.


What Happens to the temperature when a chemical changes state?

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how temperature can bring about changes in the state of matter


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What usually happens in general for a gas at a constant volume?

The gas volume become constant when the pressure is increased to a point that makes the distance between the gas molecules equal to zero at this point no more increase of temperature with pressure is observed. Or if the pressure and temperature are kept constant within a system then the volume can also be constant as long as you are able to maintain the pressure and temperature at constant level.


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Matter changes state because of temperature and pressure. These quantities bring change.


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