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# Why does ice form at the surface of a body of water

ISBN: 9780321909107 29

## Solution for problem 30RQ Chapter 15

Conceptual Physics | 12th Edition

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Problem 30RQ

Why does ice form at the surface of a body of water instead of at the bottom?

Step-by-Step Solution:
Step 1 of 3

The freezing point of water is 0°C and its maximum density is reached at 4°C. Density increases with the decrease in temperature, the entire water from the surface to its bottom will reach 4°C after a certain length of time. When it cools, the thin layer close to the surface of the water becomes denser, therefore heavier, and sinks toward the bottom of the lake, and is replaced on top warmer water which rises to the surface. If the temperature continues to drop and dips below 4°C, the layer close to the surface becomes less dense when approaching the freezing point; it then increases in volume...

Step 2 of 3

Step 3 of 3

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