why doesn't the temperature of water increase when ice melts or water boils?

Question

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Answer 1

The reason why the temperature does not change even though more heat is being added to the ice or water is that heat is needed to break the hydrogen bonds in ice to allow the phase change, and heat is needed to break the surface tension of the liquid to make water vapor. Until all the bonds are broken there cannot be any increase in temperature. Remember that temperature is just a macro measurement of the kinetic energy of the moving molecules.

Answer 2

The temperature doesn't get any higher when water is boiling or lower when water melts because when water reaches 100 degrees Celsius, the water begins to evaporate and become a gas. So it is not possible for it to get above 100 degrees, unless however you added salt. Same with when it gets too low. When it reaches 0 degrees Celsius, it will form a solid and the liquid will no longer get colder or it will change. Once again, unless you have salt. Salt will lower the freezing point of water thus making the liquid colder.

Answer 3

Temp Ice Melts

Answer 4

It's because the phase change occurs at a constant temperature for a pure substance. Water is a pure substance, so it stays at the freezing point when freezing or melting, and it stays at the boiling point when it evaporates or condenses.