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3、r CR, 100) The symbol “cd“ represents candela in the definition of SI Derived Units. Kelvin “The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.“ 13th CGPM (1967/68, Resolution 4; CR, 104) “This definition refers to w
4、ater having the isotopic composition defined exactly by the following amount of substance ratios: 0.000 155 76 mole of 2H per mole of 1H, 0.000 379 9 mole of 17O per mole of 16O, and 0.002 005 2 mole of 18O per mole of 16O.“ (Added by CIPM in 2005) The symbol “K“ represents kelvin in the definition
5、of SI Derived Units. Kilogram “The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.“ 3rd CGPM (1901, CR, 70) At the end of the 18th century, a kilogram was the mass of a cubic decimeter of water. In 1889, the 1st CGPM sanctioned the international
6、prototype of the kilogram, made of platinum-iridium, and declared: This prototype shall henceforth be considered to be the unit of mass. The symbol “kg“ represents kilogram in the definition of SI Derived Units. Meter “The meter is the length of the path traveled by light in vacuum during a time int
7、erval of 1/299 792 458 of a second.“ 17th CGPM (1983, Resolution 1, CR, 97) The symbol “m“ represents meter in the definition of SI Derived Units. Mole 1. The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its
8、 symbol is mol. 2. When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.“ 14th CGPM (1971, Resolution 3; CR, 78) “In this definition, it is understood that unbound atoms of carbon 12, at
9、rest and in their ground state, are referred to.“ (Added by CIPM in 1980) The symbol “mol“ represents mole in the definition of SI Derived Units. Second “The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the groun
10、d state of the cesium 133 atom.“ 13th CGPM (1967/68, Resolution 1; CR, 103) SAE INTERNATIONAL AIR6514 Page 9 of 1271 Unit Name Description “This definition refers to a cesium atom at rest at a temperature of 0 K.“ (Added by CIPM in 1997) The symbol “s“ represents second in the definition of SI Deriv
11、ed Units. 4.2.1.2 SI Derived Units This package identifies the derived units from the International System of Units that are used in UCS model refinements. Unit Name Description Celsius Celsius, also known as centigrade, is an SI derived scale and unit of measurement for temperature, expressed in SI
12、 base units by the formula K. Celsius is precisely related to the Kelvin scale, which defines the SI base unit of thermodynamic temperature. Absolute zero is defined as being precisely 0 K and -273.15 C. The temperature of the triple point of water is defined as precisely 273.16 K and 0.01 C. This d
13、efinition sets the magnitude of one degree Celsius and that of one kelvin as exactly the same. Additionally, it establishes the difference between the two scales null points as being precisely 273.15 degrees Celsius (-273.15 C = 0 K and 0 C = 273.15 K). Coulomb The coulomb is the SI derived unit of
14、electric charge, expressed in SI base units by the formula s A. One coulomb is equivalent to the charge transported by a steady current of one ampere in one second. CountPerSquareMeter A unit of measure for number of items in a SquareMeter. CubicMeter A cubic meter is an SI derived unit of measure o
15、f volume, expressed in SI base units by the formula m3. Day A day is a unit of measure of time duration, expressed in SI base units by the formula 86 400 s. Farad A farad is the SI derived unit of capacitance, expressed in SI base units by the formula m-2 kg-1 s4 A2. One farad is equivalent to the c
16、apacitance of a capacitor between the plates of which there appears a potential difference of one volt when it is charged by a quantity of electricity of one coulomb. Henry The henry is the SI derived unit of measure of electrical inductance, expressed in SI base units by the formula m2 kg s-2 A-2.
17、One henry is equivalent to the inductance of a closed circuit in which an electromotive force of one volt is produced when the electric current in the circuit varies uniformly at the rate of one ampere per second. Hertz The hertz is the SI derived unit of frequency, expressed in SI base units by the
18、 formula s-1, indicating the number of cycles per second of a periodic phenomenon. Hour The hour is a unit of measure of time duration equivalent to 60 minutes, expressed in SI base units by the formula 3600 s. Joule The joule is an SI derived unit of energy, work, or amount of heat, expressed in SI
19、 base units by the formula m2 kg s-2. One joule is equivalent to the energy expended (or work done) in applying a force of one newton through a distance of one meter, or in passing an electric current of one ampere through a resistance of one ohm for one second. KiloHertz A kilohertz is an SI derive
20、d unit of measure of periodic phenomena, expressed in SI base units by the formula 1000 s-1. KiloPascal The kilopascal is an SI derived unit of pressure, stress, Youngs modulus, or tensile strength, expressed in SI base units by the formula 1000 m-1 kg s-2. A kilopascal is a measure of force per uni
21、t area, equivalent to 1000 newtons per square meter. KilogramPerCubicMeter The Kilogram Per Cubic Meter is an SI derived unit of material density, expressed in SI base units by the formula kg/m3. SAE INTERNATIONAL AIR6514 Page 10 of 1271 Unit Name Description Lumens The lumen is the SI derived unit
22、of luminous flux, a measure of the total “amount“ of visible light emitted by a source, expressed in SI base units by the formula cd sr (where sr =steradian). If a light source emits one candela of luminous intensity uniformly across a solid angle of one steradian, the total luminous flux emitted in
23、to that angle is one lumen. Luminous flux differs from power (radiant flux) in that luminous flux measurements reflect the varying sensitivity of the human eye to different wavelengths of light, while radiant flux measurements indicate the total power of all light emitted, independent of the eyes ab
24、ility to perceive it. MeterPerSecond A meter per second is an SI derived unit of measure of speed, expressed in SI base units by the formula m/s. MeterPerSecondSquared A meter per second squared is an SI derived unit of measure of acceleration, expressed in SI base units by the formula m/s2. It is d
25、efined as a change in velocity (one meter per second) per time interval (one second). MeterSquared A square meter is an SI derived unit of measure of area, expressed in SI base units by the formula m2. MeterSquaredPerSecond A meter squared per second is an SI derived unit of measure of rate of incre
26、ase in area, expressed in SI base units by the formula m2/s. MeterSquaredPerSecondSquared A meter squared per second squared is an SI derived unit of measure of acceleration of increase in area, expressed in SI base units by the formula m2/s2. It is defined as a change in area (one square meter per
27、second) per time interval (one second). Minute A minute is a unit of measure of time duration equivalent to 60 seconds, expressed in SI base units by the formula 60 s. Month A month is a unit of measure of time duration which may consist of 28 to 31 days. The Gregorian Calendar will be used to deter
28、mine the numbers of days in a particular month. Newton The newton is the SI derived unit of force, expressed in SI base units by the formula m kg s-2. One newton is the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared. Ohm The ohm is the SI deri
29、ved unit of electrical resistance, expressed in SI base units by the formula m2 kg s-3 A-2. One ohm is equivalent to the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the cond
30、uctor not being the seat of any electromotive force. Pascal The pascal is the SI derived unit of pressure, stress, Youngs modulus and tensile strength, expressed in SI base units by the formula m-1 kg s-2. A pascal is a measure of force per unit area, equivalent to one newton per square meter. Perce
31、ntPerSecond Percent per second is a unit of speed. It is derived from a ratio of how large or small one quantity is, relative to another quantity (percent) and seconds. Radian A radian is the SI derived unit of angular measure, expressed in SI base units by the formula m/m. It is the ratio between t
32、he length of an arc and its radius. A full circle corresponds to an angle of 2 pi radians. RadianPerSecond Radian per second is the SI derived unit of angular velocity or rotational speed, expressed in SI base units by the formula m m-1 s-1= s-1. RadianPerSecondSquared Radian per second squared is t
33、he SI derived unit of angular acceleration, expressed in SI base units by the formula m m-1 s-1= s-1. Siemens The siemens is the SI derived unit of electric conductance or electric admittance, expressed in SI base units by the formula m-2 kg-1 s3 A2. One siemens is equivalent to the reciprocal of on
34、e ohm of resistance. This unit of measure is also known as the mho (ohm spelled backwards). SAE INTERNATIONAL AIR6514 Page 11 of 1271 Unit Name Description Steradian The steradian is the SI derived unit of measure of solid angles, expressed in SI base units by the formula m2/m2. It is used to descri
35、be two-dimensional angular spans in three-dimensional space, analogous to the way in which the radian describes angles in a plane. A steradian can be defined as the solid angle subtended at the center of a unit sphere by a unit area on its surface. For a general sphere of radius r, any portion of it
36、s surface with area A = r2subtends one steradian. Tesla The tesla is the SI derived unit of magnetic flux density, expressed in SI base units by the formula kg s-2 A-1. One tesla is equivalent to one weber per square meter. Volt The volt is the SI derived unit for electric potential difference (volt
37、age) or electromotive force, expressed in SI base units by the formula m2 kg s-3 A-1. One volt is equivalent to the potential difference between two points of a conducting wire carrying a constant current of one ampere, when the power dissipated between these points is equal to one watt. Watt The wa
38、tt is the SI derived unit of power, expressed in SI base units by the formula m2 kg s-3. One watt is equivalent to one joule per second, and measures the rate of energy conversion or transfer. Also, one watt is the rate at which work is done when an objects velocity is held constant at one meter per
39、 second against a constant opposing force of one newton. Weber The weber is the SI derived unit of magnetic flux, expressed in SI base units by the formula m2 kg s-2 A-1. One weber is equivalent to the magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of
40、1 volt if it were reduced to zero at a uniform rate in 1 second. A flux density of one weber per square meter is one tesla. A change in flux of one weber per second will induce an electromotive force of one volt. Year A year is a unit of measure of time duration, expressed in SI base units by the fo
41、rmula 31 536 000 s. A leap year is equivalent to one year plus one day, expressed in SI base units by the formula 31 622 400 s. 4.2.2 US Customary This package contains definitions for the US Customary system of units. Unit Name Description Bar The bar is a unit of pressure defined as 1,000,000 dyne
42、s per square centimeter, or, equivalently in SI units, 100 kilopascals. It is approximately equal to the atmospheric pressure on Earth at sea level. BitPerSecond Bit per second is a unit of measure of data rate. It is derived from bit and seconds. Byte The byte is a unit of digital information consi
43、sting of eight bits. CountPerSquareMile Count per square mile is a measure of population density within a given area. Decibel The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity, often power or intensity. DecibelWatt The decibel-watt (dBW) is a
44、logarithmic unit used for the measurement of the strength of a signal expressed in decibels relative to one watt. DecimalDegree Decimal degrees is a unit of angular distance. A decimal degree expresses this measure in decimal fractions. There are 360.0 decimal degrees in a full angular rotation. Dec
45、imalDegreesPerSecond Decimal degrees per second is a unit of rotational speed, or angle orientation change rate. It is derived from decimal degrees and seconds. DecimalDegreesPerSecondSquared Decimal degrees per second per second is a unit of rotational acceleration, or angle orientation acceleratio
46、n. It is derived from decimal degrees and seconds. SAE INTERNATIONAL AIR6514 Page 12 of 1271 Unit Name Description Fahrenheit Fahrenheit is a unit of thermodynamic temperature, where the freezing of water into ice is defined at 32 degrees, and the boiling point of water is defined to be 212 degrees.
47、 Feet A foot (plural: feet) is a unit of length defined as 0.3048 meters exactly. It is both a US Customary and an Imperial System unit. FeetPerSecond Feet per second is a unit of speed. It is derived from feet and seconds. FeetPerSecondSquared Feet per second per second is a unit of acceleration. F
48、ootPoundsPerSecondSquared A foot pound per second squared is a unit of measure of force. GigaByte A gigabyte is a unit of digital information. Following the IEEE specification, it is 109 bytes. Inch An inch is a unit of distance. It is defined in terms of the meter and is exactly 0.0254 meters. Inch
49、PerSecond Inch per second is a unit of speed. It is derived from feet and seconds. InchesMercury Inches of mercury is a unit of measure of pressure. It is defined as the pressure exerted by a column of mercury 1 inch in height at 320F at the standard acceleration of gravity. It is related to the SI unit of pressure (pascal) by: 1 in Hg = 3386.389 pascals at 00C KiloByte A kilobyte is a unit of digital information. Following the IEEE specification, it is 103 bytes. MegaByte A megabyte is a unit of digital inform
