has quality rime 2020-02-12T21:03:46Z 2020-11-18T19:59:42.028Z envoCryo envoPolar Rime is denser and harder than hoarfrost, but lighter, softer, and less transparent than glaze. Rime is composed essentially of discrete ice granules and has densities as low as 0.2-0.3 g cm-3. Glaze is generally continuous but with some air pockets and has much higher densities. Factors that favor rime formation are small drop size, slow accretion, a high degree of supercooling, and rapid dissipation of latent heat of fusion. The opposite effects favor glaze formation. Both rime and glaze occur when supercooled water drops strike an object at a temperature below freezing. Such formation on terrestrial objects constitutes an ice storm; on aircraft, it is called aircraft icing (where rime is known as rime ice). Either rime or glaze may form on snow crystals, droxtals, or other ice particles in the atmosphere. When such a deposit is wholly or chiefly of rime, snow pellets result; when most or all of the deposit is glaze, ordinary hail or ice pellets result. The alternating clear and opaque layers of some hailstones represent glaze and rime, deposited under varying conditions around the growing hailstone. The previously use definition was: Frost which is 1) composed primarily of granular ice tufts, 2) formed on the windward sides of exposed objects through contact with supercooled fog or cloud, and 3) built out directly against the wind. Water ice which 1) has a white or milky and opaque appearance, 2) has a granular texture, and 3) is formed as a result of the deposition and rapid freezing of supercooled water drops as they make contact with an exposed object. frost opaque granular