Explanation of Negative Coefficient of Cubical Expansion of Water:

Water normally expands when heated, following the general rule of thermal expansion. However, there is a unique behavior exhibited by water between 0 degrees Celsius and a certain temperature where its coefficient of cubical expansion becomes negative.

Reason for Negative Coefficient:

- This anomaly in the behavior of water is due to its unique molecular structure.
- At temperatures below 4 degrees Celsius, water molecules start forming a crystalline structure, causing the volume of water to decrease as it is heated.
- This decrease in volume is reflected in the negative coefficient of cubical expansion during this specific temperature range.

Implications of Negative Coefficient:

- The negative coefficient of cubical expansion of water between 0 degrees Celsius and a certain temperature has important implications in various natural phenomena.
- It is the reason why ice floats on water, as the solid form of water (ice) is less dense than its liquid form.
- This property also plays a crucial role in the survival of aquatic life during winter, as the ice formed on the surface of water acts as an insulating layer, preventing the entire body of water from freezing.

In conclusion, the negative coefficient of cubical expansion of water between 0 degrees Celsius and a certain temperature is a unique phenomenon driven by the molecular structure of water, with important implications in nature.

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