Question

ice at zero degree celsius appears colder to the mouth and the water at zero degree celsius give reason

Answer 1

Why does ice at zero degrees Celsius seem to be colder in the mouth than water at zero degrees Celsius?



Saurabh Vats, works at ONGC - MRPL

Answered Jul 13, 2017

It is due to latent heat.

Latent heat is the energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature. (See the attached photo )



The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion and that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization.

When ice melts, it is converted to the liquid water at 0 °C by absorbing latent heat of fusion. The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, which is absorbed from your surrounding (mouth). Your body releases this heat and that's why it feel colder

In case of water this “extra heat” in form of latent heat is not released, thus water appears to be warmer compared to Ice at same temperature.

Hope this helps