Nominal mass deviations

As just demonstrated, exact mass values show some deviation from nominal mass that can be on either side, higher or lower, depending on the isotopes encountered. While the matter itself can be easily understood, existing terminology in this specific field is comparatively vague. 

Fig. 3.12. Deviation from nominal mass for some oligomers as a function of nominal mass. PE polyethylene, PEG polyethyleneglycol, PIPE polytetrafluoroethylene, PVC polyvinylchloride.

Drops for oral use have to meet the requirement that the separate masses of 10 miits equivalent to the normal dose deviate maximally 10 % from the average mass. The total of 10 masses does not differ by more than 15 % from the nominal mass of 10 doses. 

This separation in m/q of different secondary ions is possible as the exact mass of every element, with the exception of C, deviates slightly from their nominal mass (reasons for this are outlined in Section 2.1.1). Indeed, all ions with Z < have a slightly greater mass than their nominal mass, whereas those... 

Pure isotopes have masses that differ measurably from the integers A (based on a scale on which has a mass defined as 12.00000 atomic mass units or amu). None of the stable nuclides (i.e. those with nuclear half-lives >10 years) deviates from integer mass by more than 0.1 amu. The nominal mass of a molecule is the sum of the A values of its constituent atoms. 

Each of the f2 samples had a nominal weight of O.f g. Determine the approximate value for fQ, and the mass of sample needed to achieve a percent relative standard deviation of 2%. 

The experiments were conducted on a heat exchanger described above, having 17 triangular micro-channels with hydraulic diameter of 157 pm and mass flow rates of 5.7 ml/min. The applied heat flux ranged from up to 35 W/cm. The deviation of q from its nominal value does not exceed 0.5%. The characteristic value of the... 

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