Abstract
The selection, on the basis of flask volume and fluid volume, of the members of a flask pair for the indirect method of manometry is very important. A poor choice yields erratic results even with flawless experimental technique. In order to determine optimal combinations, formulae of the indirect method were analyzed, and an expression for the statistical variance associated with different combinations of flask and fluid volumes was derived. Graphs and a table were constructed and can be used to select suitable combinations. As a general rule, in order to obtain the minimum variance, flasks of equal volumes should be selected and used with the maximum practical difference in fluid volumes. It was also found that the choice of flask and fluid volumes does not depend on γ; an optimal combination has a minimum variance for all values of γ.
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