CLHEP/Units/SystemOfUnits.h

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00001 // -*- C++ -*-
00002 // $Id: SystemOfUnits.h,v 1.12 2002/03/30 15:02:06 evc Exp $
00003 // ----------------------------------------------------------------------
00004 // HEP coherent system of Units
00005 //
00006 // This file has been provided to CLHEP by Geant4 (simulation toolkit for HEP).
00007 //
00008 // The basic units are :
00009 //              millimeter              (millimeter)
00010 //              nanosecond              (nanosecond)
00011 //              Mega electron Volt      (MeV)
00012 //              positron charge         (eplus)
00013 //              degree Kelvin           (kelvin)
00014 //              the amount of substance (mole)
00015 //              luminous intensity      (candela)
00016 //              radian                  (radian)
00017 //              steradian               (steradian)
00018 //
00019 // Below is a non exhaustive list of derived and pratical units
00020 // (i.e. mostly the SI units).
00021 // You can add your own units.
00022 //
00023 // The SI numerical value of the positron charge is defined here,
00024 // as it is needed for conversion factor : positron charge = e_SI (coulomb)
00025 //
00026 // The others physical constants are defined in the header file :
00027 //                      PhysicalConstants.h
00028 //
00029 // Authors: M.Maire, S.Giani
00030 //
00031 // History:
00032 //
00033 // 06.02.96   Created.
00034 // 28.03.96   Added miscellaneous constants.
00035 // 05.12.97   E.Tcherniaev: Redefined pascal (to avoid warnings on WinNT)
00036 // 20.05.98   names: meter, second, gram, radian, degree
00037 //            (from Brian.Lasiuk@yale.edu (STAR)). Added luminous units.
00038 // 05.08.98   angstrom, picobarn, microsecond, picosecond, petaelectronvolt
00039 // 01.03.01   parsec    
00040 
00041 #ifndef HEP_SYSTEM_OF_UNITS_H
00042 #define HEP_SYSTEM_OF_UNITS_H
00043 
00044 #include "CLHEP/config/CLHEP.h"
00045 
00046 // 
00047 // Length [L]
00048 //
00049 static const double millimeter  = 1.;                        
00050 static const double millimeter2 = millimeter*millimeter;
00051 static const double millimeter3 = millimeter*millimeter*millimeter;
00052 
00053 static const double centimeter  = 10.*millimeter;   
00054 static const double centimeter2 = centimeter*centimeter;
00055 static const double centimeter3 = centimeter*centimeter*centimeter;
00056 
00057 static const double meter  = 1000.*millimeter;                  
00058 static const double meter2 = meter*meter;
00059 static const double meter3 = meter*meter*meter;
00060 
00061 static const double kilometer = 1000.*meter;                   
00062 static const double kilometer2 = kilometer*kilometer;
00063 static const double kilometer3 = kilometer*kilometer*kilometer;
00064 
00065 static const double parsec = 3.0856775807e+16*meter;
00066 
00067 static const double micrometer = 1.e-6 *meter;             
00068 static const double  nanometer = 1.e-9 *meter;
00069 static const double  angstrom  = 1.e-10*meter;
00070 static const double  fermi     = 1.e-15*meter;
00071 
00072 static const double      barn = 1.e-28*meter2;
00073 static const double millibarn = 1.e-3 *barn;
00074 static const double microbarn = 1.e-6 *barn;
00075 static const double  nanobarn = 1.e-9 *barn;
00076 static const double  picobarn = 1.e-12*barn;
00077 
00078 // symbols
00079 static const double mm  = millimeter;                        
00080 static const double mm2 = millimeter2;
00081 static const double mm3 = millimeter3;
00082 
00083 static const double cm  = centimeter;   
00084 static const double cm2 = centimeter2;
00085 static const double cm3 = centimeter3;
00086 
00087 static const double m  = meter;                  
00088 static const double m2 = meter2;
00089 static const double m3 = meter3;
00090 
00091 static const double km  = kilometer;                   
00092 static const double km2 = kilometer2;
00093 static const double km3 = kilometer3;
00094 
00095 static const double pc = parsec;
00096 
00097 //
00098 // Angle
00099 //
00100 static const double radian      = 1.;                  
00101 static const double milliradian = 1.e-3*radian;
00102 static const double degree = (3.14159265358979323846/180.0)*radian;
00103 
00104 static const double   steradian = 1.;
00105         
00106 // symbols
00107 static const double rad  = radian;      
00108 static const double mrad = milliradian;
00109 static const double sr   = steradian;
00110 static const double deg  = degree;
00111 
00112 //
00113 // Time [T]
00114 //
00115 static const double nanosecond  = 1.;
00116 static const double second      = 1.e+9 *nanosecond;
00117 static const double millisecond = 1.e-3 *second;
00118 static const double microsecond = 1.e-6 *second;
00119 static const double  picosecond = 1.e-12*second;
00120 
00121 static const double hertz = 1./second;
00122 static const double kilohertz = 1.e+3*hertz;
00123 static const double megahertz = 1.e+6*hertz;
00124 
00125 // symbols
00126 static const double ns = nanosecond;                    
00127 static const double  s = second;
00128 static const double ms = millisecond;
00129 
00130 //
00131 // Electric charge [Q]
00132 //
00133 static const double eplus = 1. ;                // positron charge
00134 static const double e_SI  = 1.60217733e-19;     // positron charge in coulomb
00135 static const double coulomb = eplus/e_SI;       // coulomb = 6.24150 e+18 * eplus
00136 
00137 //
00138 // Energy [E]
00139 //
00140 static const double megaelectronvolt = 1. ;
00141 static const double     electronvolt = 1.e-6*megaelectronvolt;
00142 static const double kiloelectronvolt = 1.e-3*megaelectronvolt;
00143 static const double gigaelectronvolt = 1.e+3*megaelectronvolt;
00144 static const double teraelectronvolt = 1.e+6*megaelectronvolt;
00145 static const double petaelectronvolt = 1.e+9*megaelectronvolt;
00146 
00147 static const double joule = electronvolt/e_SI;  // joule = 6.24150 e+12 * MeV
00148 
00149 // symbols
00150 static const double MeV = megaelectronvolt;
00151 static const double  eV = electronvolt;
00152 static const double keV = kiloelectronvolt;
00153 static const double GeV = gigaelectronvolt;
00154 static const double TeV = teraelectronvolt;
00155 static const double PeV = petaelectronvolt;
00156 
00157 //
00158 // Mass [E][T^2][L^-2]
00159 //
00160 static const double  kilogram = joule*second*second/(meter*meter);   
00161 static const double      gram = 1.e-3*kilogram;
00162 static const double milligram = 1.e-3*gram;
00163 
00164 // symbols
00165 static const double  kg = kilogram;
00166 static const double   g = gram;
00167 static const double  mg = milligram;
00168 
00169 //
00170 // Power [E][T^-1]
00171 //
00172 static const double watt = joule/second;        // watt = 6.24150 e+3 * MeV/ns
00173 
00174 //
00175 // Force [E][L^-1]
00176 //
00177 static const double newton = joule/meter;       // newton = 6.24150 e+9 * MeV/mm
00178 
00179 //
00180 // Pressure [E][L^-3]
00181 //
00182 #define pascal hep_pascal                          // a trick to avoid warnings 
00183 static const double hep_pascal = newton/m2;        // pascal = 6.24150 e+3 * MeV/mm3
00184 static const double bar        = 100000*pascal; // bar    = 6.24150 e+8 * MeV/mm3
00185 static const double atmosphere = 101325*pascal; // atm    = 6.32420 e+8 * MeV/mm3
00186 
00187 //
00188 // Electric current [Q][T^-1]
00189 //
00190 static const double      ampere = coulomb/second; // ampere = 6.24150 e+9 * eplus/ns
00191 static const double milliampere = 1.e-3*ampere;
00192 static const double microampere = 1.e-6*ampere;
00193 static const double  nanoampere = 1.e-9*ampere;
00194 
00195 //
00196 // Electric potential [E][Q^-1]
00197 //
00198 static const double megavolt = megaelectronvolt/eplus;
00199 static const double kilovolt = 1.e-3*megavolt;
00200 static const double     volt = 1.e-6*megavolt;
00201 
00202 //
00203 // Electric resistance [E][T][Q^-2]
00204 //
00205 static const double ohm = volt/ampere;  // ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
00206 
00207 //
00208 // Electric capacitance [Q^2][E^-1]
00209 //
00210 static const double farad = coulomb/volt;       // farad = 6.24150e+24 * eplus/Megavolt
00211 static const double millifarad = 1.e-3*farad;
00212 static const double microfarad = 1.e-6*farad;
00213 static const double  nanofarad = 1.e-9*farad;
00214 static const double  picofarad = 1.e-12*farad;
00215 
00216 //
00217 // Magnetic Flux [T][E][Q^-1]
00218 //
00219 static const double weber = volt*second;        // weber = 1000*megavolt*ns
00220 
00221 //
00222 // Magnetic Field [T][E][Q^-1][L^-2]
00223 //
00224 static const double tesla     = volt*second/meter2;     // tesla =0.001*megavolt*ns/mm2
00225 
00226 static const double gauss     = 1.e-4*tesla;
00227 static const double kilogauss = 1.e-1*tesla;
00228 
00229 //
00230 // Inductance [T^2][E][Q^-2]
00231 //
00232 static const double henry = weber/ampere;       // henry = 1.60217e-7*MeV*(ns/eplus)**2
00233 
00234 //
00235 // Temperature
00236 //
00237 static const double kelvin = 1.;
00238 
00239 //
00240 // Amount of substance
00241 //
00242 static const double mole = 1.;
00243 
00244 //
00245 // Activity [T^-1]
00246 //
00247 static const double becquerel = 1./second ;
00248 static const double curie = 3.7e+10 * becquerel;
00249 
00250 //
00251 // Absorbed dose [L^2][T^-2]
00252 //
00253 static const double gray = joule/kilogram ;
00254 
00255 //
00256 // Luminous intensity [I]
00257 //
00258 static const double candela = 1.;
00259 
00260 //
00261 // Luminous flux [I]
00262 //
00263 static const double lumen = candela*steradian;
00264 
00265 //
00266 // Illuminance [I][L^-2]
00267 //
00268 static const double lux = lumen/meter2;
00269 
00270 //
00271 // Miscellaneous
00272 //
00273 static const double perCent     = 0.01 ;
00274 static const double perThousand = 0.001;
00275 static const double perMillion  = 0.000001;
00276 
00277 #endif /* HEP_SYSTEM_OF_UNITS_H */

Class Library for High Energy Physics (version 1.8)