Physical Units definition of Physical Units in the Free Online Encyclopedia.

Units, Physical

specific concrete physical quantities to which numerical values equal to 1 are assigned according to definition. Many units of physical quantities are represented by measures used in measurements (for example, meter, kilogram).

During the early stages of the development of material culture (in slaveholding and feudal societies), units existed for only a small number of physical quantities, such as length, mass, time, area, and volume. Units of physical quantities were selected without any relationship to each other and in a different manner in various countries and geographic regions. This led to a large number of units that were often identical in name but different in magnitude, for example, ells, feet, pounds. As trade between nations increased and science and technology developed, the number of units of physical quantities grew and the need to unify the units and create systems of units became evident. Special international agreements regarding the units of physical quantities began to be concluded. A metric system of measures was proposed in France in the 18th century, which subsequently gained international acceptance. A series of metric systems of units was devised on its basis. Further ordering of the units of physical quantities is presently in progress on the basis of the International System of Units (SI).

The units of physical quantities are divided into systematic, that is, those belonging to some system of units, and nonsystematic units (forexample, mm Hg, horsepower, electron volt). The systematic units of physical quantities are divided into the fundamental units, which are selected arbitrarily (meter, kilogram, second, and others), and the derived units, which are formed from the relationships between the quantities (meterper second, kilogram per cubic meter, newton, joule, watt). Multiple and fractional units are used to conveniently express quantities that are many times larger or smaller than the units of physical quantities. The multiple and fractional units of physical quantities are formed in metric systems (with the exception of units of angle and time) by multiplying the systematic units by 10”, where n is a positive or negative integer. A decimal prefix, adopted for the formation of multiple and fractional units, corresponds to each of these numbers.

REFERENCES

Burdun, G. D. Edinitsyfizicheskikh velichin, 4th ed. Moscow, 1967.
Burdun, G. D. Spravochnik po Mezhdunarodnoi sisteme edinits. Moscow, 1971.
Malikov, S. F., and N. I. Tiurin. Vvedenie v metrologiiu, 2nd ed. Moscow, 1966.

K. P. SHIROKOV

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No references found	These requirements include a description of major categories, physical unit information for the end of the reporting period, physical units added and withdrawn during the year, a description of the methods of acquisition and withdrawal, and condition information. Statement of Federal Financial Accounting Standards No. 29--Heritage ... by Journal of Accountancy	Physical Modeling physical modeling synthesis physical network physical oceanography physical optics physical organic chemistry physical path length Physical Perfection Physical Problems, Institute of physical property Physical Quantity physical realizability physical record physical residue physical science Physical Sequential physical stability physical stratigraphy physical system physical testing physical theory Physical Therapy physical time Physical Training, Military Physical Transport Network Physical Units physical vapor deposition physical weathering Physical-Culture and Sports Press Physicalism Physician physician assistant physician's assistant Physician, Authorized physicist Physick, Philip Syng Physicochemical Analysis Physicochemical Mechanics Physicogeographical Country Physicogeographical District Physicogeographical Map Physicogeographical Province Physicogeographical Region Physicogeographical Regionalization Physicotechnical Institute Physics Physics Analysis Workbench Physics Education Physics of Metals, Institute of the Physics of the Earth Physics of the Sea	Physical time Physical time Physical to ProLiant Physical to Virtual physical topology physical topology physical topology Physical Torture Physical Trade Balance Physical training Physical Training and Rehabilitation Program Physical Training Instructor Physical Training Leader Physical Training Rest and Recuperation Physical Training Test Physical training uniform Physical Training, Military Physical Transmission Channel Physical Transmission Rights Physical Transport Network Physical triple star Physical unit Physical unit Physical unit Physical unit Physical Unit 2 Physical Unit 2.1 Physical Unit 4 Physical Unit 5 Physical Unit Control Point Physical Units Physical Uplink Shared Channel Physical urticaria Physical urticaria Physical urticaria Physical User Interface Profile physical value Physical vapor deposition Physical vapor deposition Physical Vapor Transport Physical Vapor Transport of Organic Solids Physical Vapour Deposition Physical verification Physical Verifications physical veterinary medicine physical veterinary medicine physical veterinary medicine Physical violence Physical volume Physical Volume ID Physical Volume Library Physical Volume Repository Physical Volume Reserved Area physical vs. logical Physical Vulnerability Division Physical Wavelength Link Physical weathering Physical weathering Physical Work Environment Satisfaction Questionnaire Physical Work Performance Evaluation Physical Working Capacity at 170 beats /minute

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These requirements include a description of major categories, physical unit information for the end of the reporting period, physical units added and withdrawn during the year, a description of the methods of acquisition and withdrawal, and condition information.

Statement of Federal Financial Accounting Standards No. 29--Heritage ... by Journal of Accountancy

Physical Modeling

physical modeling synthesis

physical network

physical oceanography

physical optics

physical organic chemistry

physical path length

Physical Perfection

Physical Problems, Institute of

physical property

Physical Quantity