In order for both water droplets and ice crystals to form, particles called condensation nuclei and ice nuclei need to be present. These could be any fine substance - dust, salt, etc.

Water vapor condenses on tiny particles called cloud condensation nuclei (CCN). Raindrops are about 2 millimeters in diameter, a cloud drop is about 20 microns (.02 mm), and the nuclei is about .2 ...

Cloud seeding is a weather technique used to get more precipitation out of existing clouds. How do clouds form? To explain ...

Clouds are formed when water vapor condenses around microscopic particles in the atmosphere. These particles, called condensation nuclei, are ever-present and come from dust, smoke, salt and even ...

Schematic of the pathways for pore condensation and freezing (Upper Left), deposition nucleation (Lower Left), and homogeneous nucleation of pure water droplets (Right), followed by ice-crystal ...

These clouds must contain water that is below freezing, but has not quite frozen yet because the particles necessary (condensation nuclei) for the water to freeze on are not present.

All clouds need “seeds” called condensation nuclei or ice nuclei to properly develop. This could be a speck of dust, clay or pollen in the atmosphere. There are several temperature, moisture and air ...

Letter Published: 27 April 1946 Artificial Condensation Nuclei and Relative Humidity NAVINKUMAR DALAL Nature 157, 549 (1946) Cite this article ...

The freezing point of water is anything but a clear subject. Small droplets of the purest water only freeze at minus 37 degrees Celsius. Crystallization nuclei such as bacteria with ice-forming ...