Ice, technically

Ice, technically, may be any one of the 15 known crystalline phases of water. In non-scientific contexts, the term usually means the phase known as ice Ih, which is the most abundant of these solid phases on the Earth's surface. It can appear transparent or opaque bluish-white colour, depending on the presence of impurities or air inclusions. The addition of other materials such as soil may further alter the appearance.

The most common phase transition to ice Ih occurs when liquid water is cooled below 0°C (273.15K, 32°F) at standard atmospheric pressure. It can also deposit from vapour with no intervening liquid phase, such as in the formation of frost.

Ice appears in nature in forms of precipitation snowflakes, hail, icicles, glaciers, pack ice, and entire polar ice caps. It is an important component of the global climate, and plays an important role in the water cycle. Furthermore, ice has numerous cultural applications, from ice cooling of drinks to winter sports and the art of ice sculpting.

The word is derived from Old English īs, which in turn stems from Proto-Germanic *isaz.





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