Yes, there is an opposite to sublimation as a
phase change, when a gas condenses directly to the
solid phase bypassing the liquid. I have found
that some name this change deposition, but the
term is not frequently used. You can read more
about this at
There is an opposite to sublimation. It is
similar to condensation, except the substance goes
directly from vapor to solid. The formation of
frost is a good example:
If warm, humid air (such
as your breath) blows over a cold surface (such as
a piece of metal kept in the freezer), ice will
condense onto the surface directly from the vapor.
Snow forms in a similar way. If air temperature
must fall below freezing to reach 100% humidity,
then snow can form by reverse sublimation as
the temperature falls through the point of 100%
humidity. If the point of 100% humidity is above
freezing, rain forms as the temperature falls.
This is the opposite of evaporation. In either
case, the "surface" is provided by dust or other
microscopic particles in the atmosphere. Each
particle seeds its own snowflake or raindrop.
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