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A pound is a measure of mass, a kN is a measure of weight. The two are measures of different things and a direct conversion is not valid.
Mass and weight are two different things. It does not make sense to ask which is more accurate. Mass is used to measure an object's ability to resist a force. f = ma, or m = f/a. Weight is used to measure an object's force applied due to gravity. Measured in newtons, f = ma, or newtons = kilograms time 9.81 meters per second squared.
centimeters measure length. grams measure weight. the two are not interchangable
You do not. A gram is a measure of mass, whereas a kilometre is a measure of distance. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
Grams is a measure of weight, kilometres is a measure of distance, the two do not compare.