electric fan - Students, Britannica Kids

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…

electricity - Students, Britannica Kids

electricity - Students, Britannica Kids

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refrigeration - Students, Britannica Kids

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electricity - Students, Britannica Kids

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gasoline engine - Students, Britannica Kids

Young Pretty Girl Children Sitting On Living Room Floor Blowing Electric Fan During Summer Day And Opening Arms Enjoying Cool Wind To Refreshing. Stock Photo, Picture and Royalty Free Image. Image 93707575.