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Mechanical devices that move air and other gases are essential to human comfort and safety and to some industrial processes. Broadly speaking they are of three types. Fans…
Cartoon House Electric Fan For Kids This Is A Vector Illustration For Preschool And Home Training For Parents And Teachers High-Res Vector Graphic - Getty Images
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Encyclopedia Britannica Kids Electronic Reader and 8-Book Library
engineering - Students, Britannica Kids
electricity - Students, Britannica Kids
Europe - Students, Britannica Kids
Encyclopedia Britannica Kids - Me Reader Electronic Reader and 8 Sound Book Library - Animals and Space- PI Kids: 9781503725560: Editors of Phoenix International Publications, Editors of Phoenix International Publications, Editors
convection - Kids, Britannica Kids
heat - Students, Britannica Kids
Manchester - Students, Britannica Kids
graphite - Students, Britannica Kids
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New Jersey - Students, Britannica Kids
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