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Which combination of conditions is most favourable for the melting of ice into water?

1. High temperature and high pressure
2. High temperature and low pressure
3. Low temperature and high pressure
4. Low temperature and low pressure

Correct answer: High temperature and high pressure

Solution

High temperature directly favours melting. Because liquid water is denser than ice (Delta_V < 0 on melting), increasing pressure further lowers the melting point of ice, making melting even more favourable at a given temperature.

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