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I know water is densest at 4°C, which is why lakes freeze from the top. As water cools toward 4°C, it sinks, but as it cools further toward 0°C, it becomes less dense and rises. At 0°C it becomes ice and floats. So in a cooling lake, the 4°C water settles at the bottom, while the coldest water rises to the surface to freeze.
@fermatslibrary - Fermat's Library
Water is densest at 4°C. This property is the reason why lakes freeze from the top down. 💧 water at 4°C is denser than water at both lower and higher temperatures ❄️ as water cools from room temperature toward 4°C, it becomes denser and sinks but as it cools further from 4°C toward 0°C, it becomes less dense and rises 🧊 at 0°C liquid water turns to ice, which is less dense, which is why it floats So in a cooling lake, the sequence is: warmer water cools and sinks until it reaches 4°C, then the coldest water (approaching 0°C) actually rises to the surface where it can freeze. The 4°C water, being densest, settles at the bottom.
