Moisture and Clouds Page: 5 of 24
iii, 20 p. : ill. (some col.) ; 27 cm.View a full description of this pamphlet.
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FRAME 1
Most aircraft weather hazards are related to water in one of its three states - vapor, liquid, or
solid. Water vapor is a gaseous state and is not visible. When it changes into liquid water droplets,
it becomes visible as clouds, fog, dew, rain, or drizzle. Some water droplets can stay in the
liquid state at temperatures well below freezing, changing into ice only when disturbed by an
outside force, such as an aircraft wing. These water droplets are supercooled and cause structural
icing on aircraft. Water in the solid state appears either as frozen water droplets or as ice crystals,
such as snow. Whenever water in the atmosphere changes state, it either absorbs heat from, or
releases heat to,the air.Water in its three states in a mature
thunderstorm - "vapor" (invisible), liquid &
solid.
Water vapor is water in the
a. liquid state.
b. form of fog.
V gaseous state.
d. form of a cloud.1
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Christy, J. J. Moisture and Clouds, pamphlet, June 1971; Texas. (https://texashistory.unt.edu/ark:/67531/metapth46580/m1/5/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Boyce Ditto Public Library.