Abstract
after an average of 12 expansions is 0.0024%. The relative error in the compressibility factors at intermediate pressures is then approximately 0.0024 jt for the jth expansion, becauss this error in any individual Z value is caused only by the effect of the N O error on the subsequent expansions. Therefore, the error in compressibility factor from this source at initial pressure is 0.168%. The maximum uncertainty in the extrapolation in the curve P j n i = 1 ' N L vs. P j to get the cell constant is 0.02%. When all these possible errors are considered, the Z values determined are probably accurate to f0.19%.
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