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Freon

Freons are a group of chlorofluorocarbons use primarily as a refrigerant[?]. Prior to their implication as a major contributor to the greenhouse effect, freons were also used as aerosol propellants[?] and to foam[?] up polymer materials.

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Dynabee

... with a maximum effect when the axis starts "rolling" inside the groove. (Compare with graphic below.) Since this friction force is essential for the device's operation, the ...