wiki的supercooled water:Pure water normally freezes at 273.15 K (0 °C or 32 °F) but it can also be "supercooled" at standard pressure down to its crystal homogeneous nucleation at almost 224.8 K (−48.3 °C/−55 °F).[2]
[3] If, however, it is cooled at a rate on the order of 106 K/s, the crystal nucleation can be avoided and water becomes a glass. Its glass transition temperature is much colder and harder to determine, but studies estimate it at about 165 K (−108 °C/−162.4 °F).
如果温度下降够快,水可以在-108度才凝固
还有就是高空有逆流层,雨滴形成的时候温度高
[ 本帖最后由 工兵pro 于 2012-2-4 10:59 编辑 ] |