Question

What is ice at 278 K more effective in cooling than water at the same temperature?
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Answer 1

Answer:

it is effective in cooling as it absorbs the heat from the water

Answer 2

Answer:

This has to do with two quantities, namely Latent heat of vaporization and Latent heat of fusion.

Explanation:

Latent heat of vaporization Lv, is the amount of heat water has to absorb to change its phase from liquid form to vapour form. Latent heat of fusion Lf is the amount of heat ice needs to melt into water at a given temperature. Now, at room temperature, Lv = 2230 J/g and Lf is 334J/g.

Note that Lv is much greater than Lf at room temperature. This means that it is more easier for ice to melt than water to form vapour. Thus, ice has more cooling effect as it only requires absorption of lower amount of heat from surroundings to melt. The absorption of heat from surrounding by ice results in loss of heat from surroundings resulting in a lower temperature