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What are the three ways in which ice crystals can form in a cloud?
Wiki User
∙ 12y ago
Vapor deposition (Diffusional growth) - The vapor pressure over an ice crystal is
much lower than that over a liquid droplet. Because atmospheric properties tend to move from regions of higher pressure to regions of lower pressure, water vapor surrounding liquid droplets tends to diffuse towards the ice crystals and deposit on them. This creates a deficit of water vapor above the droplet, which evaporates to make up for it. The newly evaporated water vapor also diffuses to the ice crystal, so that the ice crystal grows at the expense of the water droplet
Accretion - As ice particles fall through the cloud at a higher velocity than cloud
droplets, it collides and collects the supercooled droplets, which freeze upon contact with the crystal. The collected droplets are known as rime.
Aggregation - Ice crystals falling through the cloud can collide with each other and stick together. This process is particularly efficient at temperatures near 0C, because the thin liquid water coating that forms on the partially melted crystals can act as an adhesive between the crystals.
Wiki User
∙ 12y ago
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