Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 85
f the forces of nature, namely, the force of gravitation. It isthe attraction of the earth, or the force of gravitation, which gives air its weight, and whichthus produces the pressureof the atmosphere. Allvacuum cleaners are so ar-ranged that the pressure ofthe atmosphere forces theair and dirt…
Physics · Home Economics
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