Glaze is is a smooth, transparent and homogeneous ice coating occurring when freezing rain or drizzle hits a surface of the temperature equal to or below 0℃, commonly known as "ornaments of trees", which is also named icicles and coagulation on trees. The rain is called freezing rain that causes glaze. In the south of China, freezing rain is also called "raining icicles", "icicles from sky" or "cattle-hide ice-layer".
The Spring and Autumn Annals says that in the 16th spring of Cheng, the very first month, it rained and ice was on trees. That is to say in the sixteenth year of the Duke Cheng of Lu (state), in the spring of 575 BC, during the first lunar month of the the Calendar of Zhou, it rained and rain and ice gathered on the branches of trees. This is the earliest record of rime in the world.
The shape of the glaze: the glaze is harder, more transparent and more dense (with density of 0.85 g/cm 3 )than other forms of ice , but the rime similar to the glaze is only 0.25 g/cm 3.
The structure of the glaze is clearly visible, and it generally got more smooth surface. the wedge of glaze is in the shape of cross-section or pick cone. It can happen on the horizontal plane and on the vertical plane as well Having a lot to do with the direction of the wind, the glaze forms in the windward side of the trees, pointing to the wind. According to their morphology, they are categorized into comb rime, oval rime, box rime and wave rime, etc.
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