In the case of modern soda-lime glass, a quick cooling will produce a glass transition at about 550°C. There is thought to be a minimum glass transition temperature at about 270°C, and if it is cooled very slowly it can still be a supercooled liquid down to just above that temperature.

Glass is called supercooled liquid because glass is an amorphous solid. Amorphous solids have the tendency to flow but, slowly. I doest not form a crystalline solid structure as particles in solids do not move but here it moves. Hence it is called a supercooled liquid.

Water normally freezes at 273.15 K (0 °C or 32 °F), but it can be “supercooled” at standard pressure down to its crystal homogeneous nucleation at almost 224.8 K (−48.3 °C/−55 °F). In the range of temperatures between 231 K (−42 °C/−43.6 °F) and 150 K (−123 °C/−189.4 °F), experiments find only crystal ice.

One way to tell your water is supercooled is to put a bottle of tap water (impure water) into the freezer at the same time as the bottle of pure water. When the tap water freezes, the pure water will be supercooled.

Unlike a crystalline solid, an amorphous solid is a solid that lacks an ordered internal structure. Some examples of amorphous solids include rubber, plastic, and gels. Glass is sometimes referred to as a supercooled liquid rather than a solid.

Originally Answered: Could a rain cloud potentially freeze in the sky and fall down to the ground? No. In fact, many clouds you see are already “frozen”, including “rain” clouds. Although clouds may look solid, they are actually made of unconnected tiny particles, mostly water or ice, floating in the air.

Freezing fog forms a coating of frost as the particles condense at ground level. If water droplets freeze and crystallise while in a cloud they will often form snow. If you created an artificial cloud and dropped the temperature the air would clear and frost would form on the walls of the chamber.