What is the freezing point of water in Celsius?

• A. 100°C
• B. 0°C
• C. -273°C
• D. 25°C

Answer: (B)

Freezing point is the temperature at which a liquid becomes a solid under a given pressure. On the Celsius scale, pure water at standard atmospheric pressure freezes at 0 degrees Celsius. This is the reference point for freezing in everyday contexts. The other numbers correspond to different phase changes or conditions: 100°C is water’s boiling point at 1 atm, -273°C is near absolute zero (far below freezing), and 25°C is typical room temperature. Real-world factors like impurities or pressure can shift the exact freezing point slightly, but 0°C is the standard value for pure water at standard pressure.