The physical state of water at 0 degrees Celsius (0°C) is both liquid and solid. This is because 0°C is the freezing point of water, where water exists in equilibrium between the solid state (ice) and the liquid state (liquid water) under normal atmospheric pressure. At this temperature, water can coexist as both ice and liquid water simultaneously.
Explanation
- At temperatures below 0°C, water exists as solid ice.
- At 0°C, water is at the melting/freezing point, so both solid and liquid phases coexist.
- Above 0°C and below 100°C, water exists in the liquid state.
- At 100°C, water is at its boiling point, where liquid water and steam coexist.
Thus, specifically at 0°C, the physical state of water is uniquely in both solid and liquid forms simultaneously due to the phase equilibrium at the freezing/melting point.
