Evaluation of the air density uncertainty: the effect of the correlation of input quantities and higher order terms in the Taylor series expansion

Abstract

Air density uncertainty is usually evaluated as if its input quantities were uncorrelated and as if the mathematical model was linear. The present work takes the CIPM 81/91 formula as a starting point and proposes arguments in favour or against in order to take into account the correlation components and the higher order terms of the Taylor series expansion in the analysis of air density uncertainty.

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