Error absolute, definition

An analysis of die hydrogen isotopic composition and impurity level was carried out by a method of gas chromatography. Impurity level did not exceed 3d04 %. Absolute error of definition of deuterium atomic concentration in gas for die region of high deuterium concentrations (>98%) is 0.05%, for wide region of concentrations - up to 0.5%. 

The feasibility of using FTIR-ATR spectroscopy for qualitative and quantitative analysis was investigated using the three known polymorphs of ganciclovir as a model system.65 Definitive identification of each polymorph was obtained from materials that did not need to be subjected to any sample handling or preparation. Quantitation of mixtures was carried out using a partial least-squares procedure, with mean absolute errors of less than 3% being reported for Form-I and Form-II, and about 6% for Form-Ill. 

For our reference sample, the mean absolute error is 1.32 kcal mol on the values. An improved version of the scheme known as G2M(RCC) brings down the mean absolute error to 0.82 kcal mol While this definitely qualifies as chemical accuracy, it does not pass muster as benchmark quality . 

The pH value obtained in this way is accompanied by an error resulting from the approximation used for the calculation of ycr. Although this error may be small in dilute solutions, the pH values obtained in this manner are not exactly equal to the values corresponding to the absolute definition of... 

Accuracy has been conventionally defined as the sum of absolute value of the systematic error and the standard deviation of the meter (MiUer, 1996). Since in the absence of hardware or software redundancy the systematic errors cannot be detected, this conventional definition is not practical. Bagajewicz, (2005) defined accuracy with... 

This relation is called Heisenberg s uncertainty relation. In our example therefore, it signifies that, as the result of the definition of the electron s position by means of the slit, which involves the uncertainty (or possible error) Aa , the particle acquires momentum parallel to the slit of the order of magnitude stated (i.e. with the indicated degree of uncertainty). Only subject to this uncertainty is its momentum known from the diffraction pattern. According to the uncertainty relation, therefore, h represents an absolute limit to the simultaneous mmsurement of co-ordinate and momentum, a limit which in the most favourable case we may get down to, but which we can never get beneath. In quantum mechanics, moreover, the uncertainty relation... 

Concerning powers, often the SI prefixes work well provided everyone knows the definitions. A common error is to use lowercase m or MM instead of capital M to represent 1000 kg. Care is needed to distinguish between gauge pressure and absolute pressure it is recommended that all pressures (except for differences in pressure) be reported as kPa-g or kPa-a. 

Mean value that would result from an infinite number of measurements of the same measurand carried out under repeatability conditions minus a true value of the measurand. In the course of a number of measurements made under the same conditions, of the same value of a given quantity, such an error either remains constant in absolute value and sign, or varies according to a definite law when the conditions change. See also Bias. 

Variations in junction potential between calibration standards and samples lead to errors in pH measurement. Absolute accuracy of 0.01 pH units is difficult to obtain, but relative differences in pH as small as 0.001 pH units can be measured. The operational definition of pH is only valid in dilute solutions, with ionic strengths <0.1 and in the... 

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