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Freezing things slowly allows the material time to re-arrange itself internally. In the example of water, ice forming slowly results in larger crystals leading to a clear glass like substance. If frozen quickly as with snow, the crystals are smaller and less organized, scattering light and appearing white.
The Wegener–Bergeron–Findeisen process (after Alfred Wegener, Tor Bergeron and Walter Findeisen []), (or "cold-rain process") is a process of ice crystal growth that occurs in mixed phase clouds (containing a mixture of supercooled water and ice) in regions where the ambient vapor pressure falls between the saturation vapor pressure over water and the lower saturation vapor pressure over ice.
Slow freezing leads to fewer but larger ice crystals while fast freezing leads to smaller but more numerous ice crystals. This difference in ice crystal size can affect the degree of residual enzymatic activity during frozen storage via the process of freeze concentration, which occurs when enzymes and solutes present in a fluid medium are ...
To facilitate faster and more efficient freeze drying, larger ice crystals are preferable. The large ice crystals form a network within the product which promotes faster removal of water vapor during sublimation. [2] To produce larger crystals, the product should be frozen slowly or can be cycled up and down in temperature in a process called ...
In this case, food items are subjected to temperatures well below [clarification needed] the freezing point of water. Thus, smaller ice crystals are formed, causing less damage to cell membranes. [4] Flash freezing techniques are used to freeze biological samples quickly so that large ice crystals cannot form and damage the sample. [5]
On top of that, cold air can't hold much water vapor. Thus the water vapor doesn't stay in the air as it condenses out, giving you the cloud of ice crystals you see.
The symmetric shapes are due to depositional growth, which is when ice forms directly from water vapor in the atmosphere. [5] Small spaces in atmospheric particles can also collect water, freeze, and form ice crystals. [6] [7] This is known as nucleation. [8] Snowflakes form when additional vapor freezes onto an existing ice crystal. [9] [10]
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