Frozen drop of water in a very cold environment, approximately -180 degrees Celsius. You can observe the beautful ice crystals formation. First, I put a copper plate in a foam box, and cooled it with liquid nitrogen at its boiling point. After that, I began to drip water droplets on the surface of the cold copper plate, from which they began to freeze very quickly. At a certain height the temperature increased, causing the water vapor floating above the nitrogen layer to condense on the surface of the frozen water, turning into beautiful ice crystals. This process can be associated with the formation of clouds or precipitation, when water crystals are formed at the boundary of temperature media. The drops themselves freeze very quickly on the copper surface at a very low temperature, and also have a slightly different structure.
<a href="//commons.wikimedia.org/wiki/User:Bilovitskiy" title="User:Bilovitskiy">Maxim Bilovitskiy</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>