What is the difference between defining an SI base unit and realizing it? How is

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What is the difference between defining an SI base unit and realizing it? How is the kg defined? How might the kg be realized at a QA lab in a manufacturing facility. How would you ensure that the realization in #3 is traceable. Are all traceable measurements made in the US "traceable to NIST"? Why or why not. Define uncertainty. What determines if a source of uncertainty is treated as Type A or Type B Describe the default decision rule for acceptance or rejection of a part according to ISO 14253 Part 1.

Explanation / Answer

2. It is defined asmass of particular standard specimen made of platinum- iridium which is kept at International Bureau of weights and standard.

6 Uncertainity is stated as a non negative parameter charaterizing the dispersion of values attributed to measured quantity. All measurement are subject to uncertainity and a measurement result is complete only when when it is accompanied by statement of associated uncertainty. for example: a measurement of 5.07(+/-) 0.02 g means that the experimrnter is confident that the actual value for the quantity being measured lies between 5.05g and 5.09g. The uncertanity is the experimrnters best estimate of how far an experiment quantity might be from the "true value."

7 Whenever uncertainty estimates of measurement are obtained as standard deviations of repeated measurements , results, it is termed as Type A uncertainty. While uncertainty is estimated using some other means than statistical treatment of repeated measurement results then the obtained estimates is Type B uncertainity

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