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Is this equation correct?

equation 1: mass=density(density-density)

Im asking this because in air correction we have equation 2: mass=density(density-density)/density(density-density) -----here we get mass.But get we mass still in this case?:mass=density(density-density)

Because I was trying to derive this using a dimension principle,but it doesn t fit in equation 1,because:m=kg/m3*kg/m3 which is kg2/m6 and this doesn t equal to mass.

Please try to explain me this by using dimension principle as well.

Thanks

equation 1: mass=density(density-density)

Im asking this because in air correction we have equation 2: mass=density(density-density)/density(density-density) -----here we get mass.But get we mass still in this case?:mass=density(density-density)

Because I was trying to derive this using a dimension principle,but it doesn t fit in equation 1,because:m=kg/m3*kg/m3 which is kg2/m6 and this doesn t equal to mass.

Please try to explain me this by using dimension principle as well.

Thanks

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