Weight

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Related to atomic weight: molecular weight

Weight

Weighted

Describing an average in which some values count for more than others. For example, if an index consisting of 10 stocks is weighted for price, this means that the average price of the stocks will move more when the stocks with higher price move. Most indices use weighted averages so "smaller" values do not affect the index inordinately. This helps correct for the fact that averages tend to be affected by extreme values. One of the most common ways of weighting an average is to weight for market capitalization.
References in periodicals archive ?
Table 1: Continued fraction representations of the 20 most accurately determined atomic weights (Helium and the set of 19 mononuclidic non-radioactive elements), x = 1.
Just as the weight listed on your driver's license doesn't necessarily reflect your actual poundage, the official atomic weights of most chemical elements are actually more like ballpark estimates than precise constants.
At a conference held in Karlsruhe, Germany, chemists discuss the need for an improved and consistent atomic weight scale.
It was then found that the vast majority of atomic weights of the polynuclidic elements could be reproduced through continued fractions as well.
Medium atomic weights are available - Gold, Lead, Copper, Jet, Diamond, Radium, Sapphire, Silver and Steel.
In this way, inaccuracies due to uncertainties in the atomic weights of the elements are largely eliminated, since the latter are likely to be the same in all proteins in a given sample.
New features in the 2004 edition include 1,200 updated chemical structures; 978 modified entries; 112 new generic drug names (with 54 new USAN listings); and approximately 734 recomputed molecular weights based on the latest atomic weights.
Isotopes are variants of the same element with different atomic weights.
This machine knows the atomic weights of millions of microscopic particles and can recognise each one.
IUPAC Commission on Atomic Weights and Isotopic Abundances, Pure Appl.
IUPAC is recognized as the world authority on chemical nomenclature, terminology, standardized methods for measurement, atomic weights and many other critically evaluated data.
Table gets flex The atomic weights of 10 chemical elements in the periodic table (including chlorine, below) are listed as ranges rather than single numbers, the first phase in an overhaul of almost every element in the table (SN: 1/29/11, p.