Nonmetric Units

There are units that have been in use for so many years that scientists continue to use them even though they are not SI units. These units, their abbreviations, and their equivalencies to SI units are the following  

The unit Angstrom is named after the Swedish physicist Anders Jonas Angstrom (l8l4-74). In Swedish, the letter A is always written A. In English, the circle over the A is often omitted. 

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Case studies 2 and 3 were carried out by the National Institute of Standards and Technology (NIST)—an agency of the U.S. government and by statute is not subject to copyright in the United States. Certain commercial equipment, instruments, materials, or companies are identified in this paper to adequately specify the experimental procedure. This in no way implies endorsement or recommendation by NIST. The policy of NIST is to use SI units of measurement in all its publications, and to provide statements of uncertainty for all original measurements. In this document, however, data from organizations outside NIST are shown, which may include measurements in nonmetric units or measurements without uncertainty statements. 

I use the SI (metric) units with the exception of some well-established nonmetric units, which, it seems, are here to stay. Examples are MeV, keV, and eV for energy the bam for cross sections the curie and the rem. These units are given in parentheses along with their SI counterparts. 

In underwater acoustics, the metric system has not been universally applied, and a number of nonmetric units are stOlused distances of nautical rmles (1852 m), yards (0.9144 m), and kiloyards speeds of knots (nautical miles per hour) depths of fathoms (6 feet or 1.8288 m) and bearing in degrees (0.01745 rad). In the past two decades, however, there has been a conscious effort to become totally metric, that is, to use meter-kilogram second (MKS) or Standard International units. 

Referring to Table 1.3, suggest an appropriate metric system unit for each nonmetric unit in Exercise 1.29. 

In addition to these signal processing features, some balances also provide useful convenience options such as conversion to nonmetric units, parts counting, weight statistics, percentage calculation, and animal weighing. 

Generally speaking in science, the metric system is preferred, although nonmetric units may persist in areas where they are familiar to scientists working in that area. Most units have some shorthand form of abbreviation that scientists have been using for centuries. 

The International System of Units is not broad enough to provide a field of study or advanced course work and, by itself, is unlikely to form the basis of a career. However, during the process of converting from a nonmetric measurement system to a metric system, opportunities will arise for those familiar with SI to create and provide training to facilitate understanding and use of the metric system. 

B- Nonmetric length units less than one meter ... 

B. Nonmetric area units (with square meter equivalaits) ... 

B. Nonmetric volume units (with cubic meta and liter equivalents) ... 

D. Nonmetric pressure units (with pascal equivalents)... 

B- Nonmetric power units (with watt equivalents) ... 

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