coficiant of friction
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A fraction in chemistry is a quantity collected from a batch of a substance in a fractionating separation process. In such a process, a mixture is separated into fractions, which have compositions that vary according to a gradient. A fraction can be defined as a group of chemicals that have similar boiling points.
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Coefficient of friction is defined as the ratio of the force required to move tow sliding surfaces over each other, and the force holding them together.
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