harmonic mean 

https://doi.org/10.1351/goldbook.H02745
The number of observations, divided by the sum of reciprocals of the observations. Symbol: x¯h. It can be calculated with the formula: x¯h=n∑xj−1
Note:
As in the case of the geometric mean, this quantity is sometimes directly (but inappropriately) calculated, for example, when evaluating kinetic analytical results where the reaction time is inversely proportional to concentration.
Source:
PAC, 1994, 66, 595. (Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations 1994)) on page 602 [Terms] [Paper]
Citation: 'harmonic mean' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.H02745 RIS BibTex EndNote
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Last revised: February 24, 2014