SI units, or those the CIPM recognizes, express quantity values. Other units, if used, may appear in parentheses after the appropriate SI or recognized units. The CIPM uses no abbreviations for names and only accepted unit symbols, unit names, prefix symbols, and prefix names. It makes no differentiation in symbol use for a plural, and the only time a period follows a unit symbol is at the end of a sentence. The addition of subscripts does not change a unit name or symbol. [Pg.246]

The SI unit of luminous flux, abbreviated hn. One lumen is the amount of luminous flux emitted in a unit solid angle of one steradian by a uniform point source having a luminous intensity of one candela. 2. The interior space of a tubular structure such as an intestine or artery. [Pg.433]

Joule The SI unit of work. Abbreviated J, it is equal to 0.2388 calories. [Pg.121]

SI is an abbreviation of the French Systeme International d Unites or the International System of Units. It is the most widely used system of units in the world and is the system used in science. The use of many SI units in the United States is increasing outside of science and technology. There are two types of SI units base units and derived units. The base units are [Pg.21]

Electromotive force (emf) — Symbol E, SI unit V, abbreviation emf. (The symbol of Emf is no longer recommended for this quantity by IUPAC.) [Pg.227]

The positive or negative charge (commonly symbohzed by Q or g) on a molecule, radical, or particle resulting from the deficient or excess accumulation of electrons. Electric charge need not be an integer value. The SI unit coulomb (abbreviated C) equals the quantity of electricity transferred by an electric current of 1 ampere over the period of 1 second. [Pg.221]

Abbreviated list of equivalences for converting units commonly used by chemical engineers to acceptable SI units [Pg.799]

The CIPM has approved twenty prefixes for SI units (see Table 3) and permits the use of any SI prefix with an SI unit, with one exception. The SI unit for mass, the kilogram, already has a prefix in its name and can have no other SI prefix. To use prefixes with a unit for mass, the rule is to remove the kilo prefix and add the new prefix to gram (unit symbol g), as in milligram and its abbreviation mg. [Pg.246]

Table 6 presents a detailed list of conversion factors that can be used to convert between U.S.-British units and SI units, while Table 7 gives a simplified and abbreviated list of equivalences for converting unacceptable units commonly used by chemical engineers into acceptable SI units. [Pg.790]

The Systeme International d Unites (International System of Units) has the abbreviation SI. It includes base units, supplementary and derived units which together form a coherent system of units. Prefixes are used to form decimal multiples and sub-multiples of the SI units. [Pg.57]

The SI unit of quantity is called the mole (symbol n and abbreviation mol). It is derived from the Latin moles (meaning a mass ). One mole of a substance contains Avogadro s number of elementary units of the substance. Because atoms and molecules are extremely small entities, Avogadro s number (Na) is incomprehensibly large, 6.022 X 1023 particles/mol. Thus, one mole of hydrogen atoms contains 6.02 2 X 1023 H atoms, one mole of sucrose molecules consists of 6.02 2 X 1023 sucrose molecules, and so forth. [Pg.140]

Background Radiation amount of natural radiation detected in the absence of nonnatural radioactive sources Base a substance that yields hydroxide ions in solution or accepts protons Becquerel SI unit for activity equal to one disintegration per second, abbreviated Bq [Pg.336]

Follow all usage conventions given for units of measure. Use the abbreviations for SI units with capital and lowercase letters exactly as they appear in Tables 11A-1 to 11A-6. [Pg.228]

In addition to SI units ("Systeme International ), the still occasionally used cgs system and the list of symbols at the beginning of the book, the following standard abbreviations are used [Pg.22]

A glossary of abbreviations used in the text is given on page xi. As in previous volumes, this Reporter has not attempted to restrict the authors to the use of SI Units, and conversion factors to SI units are given on page xii. [Pg.187]

In 1960, the eleventh General Conference on Weights and Measures recommended the International System of Units (Systeme International d Unites), abbreviated as SI units, for use in science SI units are essentially the rationalized mks system of units. Relations between SI units and Gaussian units are given in Table A.4 of the Appendix. Table A.5 allows one to convert equations from SI to Gaussian units. [Pg.266]

When we consider the mechanical properties of polymeric materials, and in particular when we design methods of testing them, the parameters most generally considered are stress, strain, and Young s modulus. Stress is defined as the force applied per unit cross sectional area, and has the basic dimensions of N m in SI units. These units are alternatively combined into the derived unit of Pascals (abbreviated Pa). In practice they are extremely small, so that real materials need to be tested with a very large number of Pa [Pg.95]

Table 1 shows some symbols and abbreviations commonly used in analytical chemistry Table 2 shows some of the alternative methods for expressing the values of physical quantities and the relationship to the value in SI units. [Pg.240]

A substantial number of definitions in the terminology section are either of physical quantities or are expressed mathematically. In such cases, there are recommended symbols for the quantities and, when appropriate, corresponding SI units. Other terms have eommon abbreviations. The following format is used to indicate these essential eharaeteristics name of term (abbreviation), symbol, SI unit unit. Typical examples are tensile stress,

Several terms used in vernacular science are not appropriate for scientific communication. The CIPM does not use such terms as parts per million, parts per billion, or parts per trillion or their abbreviations as expressions of quantities. The word weight is a force with the SI unit of newton, not a synonym for mass with the SI unit of kilogram. Terms for an object and quantities describing the object require a clear different action. Normality, molarity, and molal are obsolete terms no longer used. [Pg.247]

Later chapters are concerned with recommended mathematical notation (chapter 4), the present best estimates of physical constants (chapters 5 and 6), conversion factors between SI and non-SI units with examples of their use (chapter 7) and abbreviations and acronyms (chapter 8). References (on p. 133) are indicated in the text by numbers (and letters) in square brackets. [Pg.170]

Pressure-sensitive adhesives are used in a great variety of applications, most commonly for adhesive tapes. In that case, they have to be tested by static shear test or dynamic shear test The difference between these two methods is that in static shear test a standard force is being applied to the test specimen and the adhesive failure is reported as the time it takes for failure to occur. The dynamic shear test involves a force being applied to the PSA tape at a specific rate of speed (typically 0.25 mm or 0.1 in. per minute). The value reported is as the peak force per unit area (Ib/in, also abbreviated as psi, and in SI units MPa) required to cause adhesive failure. The standards for adhesion shear tests are ASTM D3654, ISO EN 1943, and PSTC-107.i i [Pg.150]

Section 2 combines the former separate section on Mathematics with the material involving General Information and Conversion Tables. The fundamental physical constants reflect values recommended in 1986. Physical and chemical symbols and definitions have undergone extensive revision and expansion. Presented in 14 categories, the entries follow recommendations published in 1988 by the lUPAC. The table of abbreviations and standard letter symbols provides, in a sense, an alphabetical index to the foregoing tables. The table of conversion factors has been modified in view of recent data and inclusion of SI units cross-entries for archaic or unusual entries have been curtailed. [Pg.1286]

Scientists measure many different quantities—length, volume, mass (weight), electric current, temperature, pressure, force, magnetic field intensity, radioactivity, and many others. The metric system and its recent extension, Systeme International d Unites (SI), were devised to make measurements and calculations as simple as possible. In this chapter, length, area, volume, and mass will be introduced. Temperature will be introduced in Sec. 2.7 and used extensively in Chap. 11. The quantities to be discussed here are presented in Table 2-1. Their units, abbreviations of the quantities and units, and the legal standards for the quantities are also included. [Pg.10]

See also in sourсe #XX -- [ Pg.2 , Pg.3 ]

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