(a) Why is melting ice a better coolant than water at zero degree… - Vidyadip

Question

(a) Why is melting ice a better coolant than water at zero degree celsius?
(b) Why does ice-cream feel more colder than water at $0^{\circ} C$ ?
(c) Why does the weather become warm, when it snows?

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Answer

(a) It is because ice absorbs 336000 J heat energy per kg from the surroundings while melting, as compared to 1 kg of water $0^{\circ} C$. Hence, cooling produced by ice is much more than water at $0^{\circ} C$.
(b) Ice extracts $336 J / g$ more heat from the mouth compared to 1 gm of water at $0^{\circ} C$ on account of its highest sp. latent heat of Fusion. Thus, ice-cream feels colder than water at $0^{\circ} C$.
(c) As water vapour freezes, it releases large amount of energy into the atmosphere owing to its highest specific latent heat. Thus the weather becomes warm.

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