# How to explain the anomalous expansion of water in simple words?

In the case of fluids, with the rise of temperature, the volume increases. Therefore, the density decreases. But, water expansion shows an anomalous behavior for a specific temperature zone. As we explain this behavior we will get to know why water has its maximum density (and hence minimum volume) at 4°C. Volume – temperature graph of water – showing abnormal behavior of water expansion

Heating of water: Water contracts on heating between the temperature 0°C to 4°C. That means when the temperature of water increases from 0°C to 4°C, its volume decreases. As a result, the density of water increases as its temperature rises from 0°C to 4°C. Density – temperature graph of water – showing abnormal behavior of water expansion

Cooling of water: When water is cooled below the room temperature (i.e., normal temperature), the volume of a given amount of water decreases (and density increases) until its temperature reaches 4°C. It’s like other fluids.

But Below 4°C, water exhibits anomalous behavior. Below 4°C the volume of water increases (and hence density decreases).

So, it is clear that water has its maximum density (and hence minimum volume) at 4°C.

How to explain the anomalous expansion of water in simple words?
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