Mass is the amount of matter present and may be expressed in mg, g, kg ; and in lbm and in slugs .
Weight, W , is the gravitational force on a given mass and may be expressed in N or in lbf .
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Mass is the amount of matter present and may be expressed in mg, g, kg ; and in lbm and in slugs .
Weight, W , is the gravitational force on a given mass and may be expressed in N or in lbf .