Ice-point definitions

The temperature, equal to 0°C (32°F), at which pure water and ice are in equilibrium in a mixture at 1 atmosphere of pressure.
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The temperature, equal to 0°C (32°F), at which pure water and ice coexist in equilibrium at 1 atmosphere of pressure.
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The freezing point of pure water at one atmosphere; 0°C (32°F).
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