Fourteen standard mixtures composed of ambient levels of CO 2 , Ar, O 2 , and N 2 have been prepared in 10-L high-pressure aluminum cylinders by a gravimetric technique for atmospheric O 2 measurements. A highly precise balance with a precision of 2.5 mg is used to determine the masses of individual components in the cylinders. To balance the buoyant forces on both sides of the balance beam during weighing the gravimetric standard cylinder, a same sized cylinder is placed on a pan on the opposite side of …
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