Question

Why is ice is more effective than water in cooling at same temperature?

Answer 1

Latent heat of fusion

• The heat energy required to change $1\mathrm{kg}$ of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.
• This process results in the molecules within the substance becoming less organized.

Ice is more effective than water

• At the same temperature, ice is more effective than water.
• At $273\mathrm{K}$, ice absorbs more heat from the substance than water, allowing it to overcome the latent heat of fusion and hence provide a more effective cooling effect.
• Water does not absorb any extra heat from the substance.