Question

If the surface of water in a lake is just going to freeze, then the temperature of water at the bottom is :

• A. 0°C
• B. 4°C
• C. None of these
• D. 3°C

Answer 1

Answer:

B. 4°C

It would be 4°C . Water achieves its maximum density at roughly 4°C. That is, water (including ice) at all other temperatures below or above 4°C is less dense. Since matter is ordered from top to bottom by increasing density, any 4°C water in a lake will be found at the bottom.