Originally posted by joeprim
Not that I understand converting weight to mass.
Mass is an inherent property of matter. Weight is its force of gravitational attraction to the nearest planet. At any given altitude above the earth, weight and mass are proportional, and we can freely equate 2.2 lbs (weight/force) with 1 kg (mass). It is more accurate to say that every kg of mass weighs 2.2 lbs. In outer space, your weight will indeed drop towards 0, but your mass will be unchanged.
This is the one place the English system of units wins out over the metric system on a technicality. A typical spring scale, whether calibrated in kg or lbs, actually responds directly to weight, rather than to mass.
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