. What is the physical state of water at
(a) 25°C (b) 0°C (c) 100°C?
Answer: (a) At 25°C, the water will be in liquid form (normal room temperature)
(b) At 0°C, the water is at its freezing point, hence both solid and liquid phases are observed.
(c) At 100°C, the water is at its boiling point, hence both liquid and gaseous state of water (watervapour) are observed.