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A gram is used to measure weight and a km to measure distance. As they measure different things, there is no formula to convert between them.
A gram measures mass.
None. A gram is a measure of mass. ppm is a measure of concentration or the ratio of two masses (or even two volumes). The two measure different things and, according to elementary rules of dimensional analysis, comparing one with the other is not valid.
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.
There can be no equivalence. A gram is a measure of mass while a square centimetre is a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.