Water is not used as a therometric liquid mainly because of:

Explanation

The correct answer is that water does not expand linearly. Water's anomalous expansion, particularly its contraction from 0°C to 4°C and subsequent expansion, leads to non-linear behavior that renders it unsuitable as a thermometric liquid. An accurate thermometer requires a liquid that expands uniformly with temperature changes. While its boiling and freezing points limit its range, these are not the fundamental reasons for its unsuitability, as demonstrated by other liquids used in thermometers for specific temperature ranges.