Explain why the temperature rises until the end-point is reached?
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An interesting property of matter is that its temperature will remain constant during a phase change, assuming its surrounding pressure is constant.
In other words, once the temperature of a liquid reaches its boiling point, the temperature will not increase until all the liquid has changed its phase to become a gas. Likewise, once the temperature of a liquid is lowered to its freezing point, the temperature will not decrease until all the liquid has changed its phase to become a solid. A similar effect occurs in the opposite direction.
Temperature is the average kinetic energy (KE) of the material's molecules. That means for a given temperature there will be some molecules moving faster and having a higher kinetic energy, while others move at a slower speed.
In other words, once the temperature of a liquid reaches its boiling point, the temperature will not increase until all the liquid has changed its phase to become a gas. Likewise, once the temperature of a liquid is lowered to its freezing point, the temperature will not decrease until all the liquid has changed its phase to become a solid. A similar effect occurs in the opposite direction.
Temperature is the average kinetic energy (KE) of the material's molecules. That means for a given temperature there will be some molecules moving faster and having a higher kinetic energy, while others move at a slower speed.
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