Water freezes at zero degrees centigrade.

水在零摄氏度结冰。

《新英汉大辞典》

When the temperture is below zero, water freeses and ice forms.

当温度低于零度时，水就会凝结成冰。

youdao

If the temperature drops below zero degree, water will turn into ice.

如果气温降到零度以下，水就会结冰。

youdao

But this is a compound, right, it has some non-zero heat of formation from the elements. So is water, right?

但这是种化合物，对吧？,它具有非零的生成热,水也是一样，对吧？

麻省理工公开课 - 热力学与动力学课程节选

And our other reference point is the triple point of water - reference points become zero Kelvin, absolute zero, and the triple point.

而使用绝对零度,它与压强无关,是最低的温度，另一个参考点是水的三相点。

麻省理工公开课 - 热力学与动力学课程节选

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