The top of a lake is frozen. Air in contact is at - 15°C. What do you expect the maximum temperature of water (i) in contact with the lower surface of ice an (ii) at the bottom of the lake ?

Explanation

To solve the question regarding the maximum temperature of water in contact with the lower surface of ice and at the bottom of the lake, we can follow these steps:

### Step 1: Understand the temperature of ice
The top of the lake is frozen, which means the ice is at 0°C (the freezing point of water). The air in contact with the ice is at -15°C, but this does not affect the temperature of the ice itself.

**Hint:** Remember that the temperature of ice is at its melting/freezing point when it is in equilibrium with water.

### Step 2: Determine the temperature of water in contact with the lower surface of ice
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