Status Change of Water





Melting point and heat of fusion

When you apply heat to ice (solid), the temperature rises gradually. By the way, when the ice melts, the temperature does not rise. That is, while the solids are melting, the temperature remains constant. (Melting point)
At the melting point, the temperature is kept constant even if the heat energy is supplied. This is because all of the supplied thermal energy is used to change the solid state to liquid state. The heat energy absorbed by a material when it changes state from solid to liquid is called 'heat of fusion'.

Boiling point and Heat of vaporization

When heat is applied to water (liquid), the temperature rises gradually. However, when the liquid is boiling, the temperature does not rise. In other words, the temperature remains constant while the liquid is boiling (boiling point).
At the boiling point, the temperature is kept constant even if the heat energy is supplied. This is because all the supplied thermal energy is used to change the state of the liquid into gas. The heat energy absorbed by a material when it changes state from liquid to gas is called 'vaporization heat'.

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