Bīngcùsuān zài dīwēn xià huì jiéchéng bīng yīyàng de jīngtǐ.
Glacial acetic acid forms ice-like crystals at low temperatures.
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'冰' (ice) because pure, water-free acetic acid freezes around 16.6 °C into clear, glassy crystals. Everyday vinegar is a much more dilute solution of the same acid (醋酸 = acetic acid).
