Freezing point of water in Celsius?

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Multiple Choice

Freezing point of water in Celsius?

Explanation:
Freezing point is the temperature at which a liquid becomes a solid under standard pressure. For pure water at 1 atm, that transition happens at 0 degrees Celsius. So 0°C is the freezing point. The other values correspond to other familiar temperatures: 20°C is typical room temperature, well above freezing, and water is liquid there; 100°C is the boiling point at 1 atm, not freezing; -10°C is below freezing, so water would be ice, but it isn’t the defined freezing point under standard conditions. (Note that impurities can lower the freezing point, but the standard reference for pure water is 0°C.)

Freezing point is the temperature at which a liquid becomes a solid under standard pressure. For pure water at 1 atm, that transition happens at 0 degrees Celsius. So 0°C is the freezing point. The other values correspond to other familiar temperatures: 20°C is typical room temperature, well above freezing, and water is liquid there; 100°C is the boiling point at 1 atm, not freezing; -10°C is below freezing, so water would be ice, but it isn’t the defined freezing point under standard conditions. (Note that impurities can lower the freezing point, but the standard reference for pure water is 0°C.)

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