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SystemOfUnits.h
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1 // -*- C++ -*-
2 // $Id: SystemOfUnits.h,v 1.3 2007/09/24 15:11:47 hmd Exp $
3 // ----------------------------------------------------------------------
4 // HEP coherent system of Units
5 //
6 // This file has been provided to CLHEP by Geant4 (simulation toolkit for HEP).
7 //
8 // The basic units are :
9 // millimeter (millimeter)
10 // nanosecond (nanosecond)
11 // Mega electron Volt (MeV)
12 // positron charge (eplus)
13 // degree Kelvin (kelvin)
14 // the amount of substance (mole)
15 // luminous intensity (candela)
16 // radian (radian)
17 // steradian (steradian)
18 //
19 // Below is a non exhaustive list of derived and pratical units
20 // (i.e. mostly the SI units).
21 // You can add your own units.
22 //
23 // The SI numerical value of the positron charge is defined here,
24 // as it is needed for conversion factor : positron charge = e_SI (coulomb)
25 //
26 // The others physical constants are defined in the header file :
27 // PhysicalConstants.h
28 //
29 // Authors: M.Maire, S.Giani
30 //
31 // History:
32 //
33 // 06.02.96 Created.
34 // 28.03.96 Added miscellaneous constants.
35 // 05.12.97 E.Tcherniaev: Redefined pascal (to avoid warnings on WinNT)
36 // 20.05.98 names: meter, second, gram, radian, degree
37 // (from Brian.Lasiuk@yale.edu (STAR)). Added luminous units.
38 // 05.08.98 angstrom, picobarn, microsecond, picosecond, petaelectronvolt
39 // 01.03.01 parsec
40 // 28.04.06 import from CLHEP to GaudiKernel -- HD
41 // 11.05.06 Rename pascal to Pa to avoid warnings on Windows - MC
42
43 #ifndef GAUDI_SYSTEM_OF_UNITS_H
44 #define GAUDI_SYSTEM_OF_UNITS_H
45
46
47 namespace Gaudi {
48 namespace Units {
49
50 //
51 // Length [L]
52 //
53 static const double millimeter = 1.;
54 static const double millimeter2 = millimeter*millimeter;
55 static const double millimeter3 = millimeter*millimeter*millimeter;
56
57 static const double centimeter = 10.*millimeter;
58 static const double centimeter2 = centimeter*centimeter;
59 static const double centimeter3 = centimeter*centimeter*centimeter;
60
61 static const double meter = 1000.*millimeter;
62 static const double meter2 = meter*meter;
63 static const double meter3 = meter*meter*meter;
64
65 static const double kilometer = 1000.*meter;
66 static const double kilometer2 = kilometer*kilometer;
67 static const double kilometer3 = kilometer*kilometer*kilometer;
68
69 static const double parsec = 3.0856775807e+16*meter;
70
71 static const double micrometer = 1.e-6 *meter;
72 static const double nanometer = 1.e-9 *meter;
73 static const double angstrom = 1.e-10*meter;
74 static const double fermi = 1.e-15*meter;
75
76 static const double barn = 1.e-28*meter2;
77 static const double millibarn = 1.e-3 *barn;
78 static const double microbarn = 1.e-6 *barn;
79 static const double nanobarn = 1.e-9 *barn;
80 static const double picobarn = 1.e-12*barn;
81
82 // symbols
83 static const double nm = nanometer;
84 static const double um = micrometer;
85
86 static const double mm = millimeter;
87 static const double mm2 = millimeter2;
88 static const double mm3 = millimeter3;
89
90 static const double cm = centimeter;
91 static const double cm2 = centimeter2;
92 static const double cm3 = centimeter3;
93
94 static const double m = meter;
95 static const double m2 = meter2;
96 static const double m3 = meter3;
97
98 static const double km = kilometer;
99 static const double km2 = kilometer2;
100 static const double km3 = kilometer3;
101
102 static const double pc = parsec;
103
104 //
105 // Angle
106 //
107 static const double radian = 1.;
108 static const double milliradian = 1.e-3*radian;
109 static const double degree = (3.14159265358979323846/180.0)*radian;
110
111 static const double steradian = 1.;
112
113 // symbols
114 static const double rad = radian;
115 static const double mrad = milliradian;
116 static const double sr = steradian;
117 static const double deg = degree;
118
119 //
120 // Time [T]
121 //
122 static const double nanosecond = 1.;
123 static const double second = 1.e+9 *nanosecond;
124 static const double millisecond = 1.e-3 *second;
125 static const double microsecond = 1.e-6 *second;
126 static const double picosecond = 1.e-12*second;
127 static const double femtosecond = 1.e-15*second;
128
129 static const double hertz = 1./second;
130 static const double kilohertz = 1.e+3*hertz;
131 static const double megahertz = 1.e+6*hertz;
132
133 // symbols
134 static const double ns = nanosecond;
135 static const double s = second;
136 static const double ms = millisecond;
137
138 //
139 // Electric charge [Q]
140 //
141 static const double eplus = 1. ; // positron charge
142 static const double e_SI = 1.60217733e-19; // positron charge in coulomb
143 static const double coulomb = eplus/e_SI; // coulomb = 6.24150 e+18 * eplus
144
145 //
146 // Energy [E]
147 //
148 static const double megaelectronvolt = 1. ;
149 static const double electronvolt = 1.e-6*megaelectronvolt;
150 static const double kiloelectronvolt = 1.e-3*megaelectronvolt;
151 static const double gigaelectronvolt = 1.e+3*megaelectronvolt;
152 static const double teraelectronvolt = 1.e+6*megaelectronvolt;
153 static const double petaelectronvolt = 1.e+9*megaelectronvolt;
154
155 static const double joule = electronvolt/e_SI; // joule = 6.24150 e+12 * MeV
156
157 // symbols
158 static const double MeV = megaelectronvolt;
159 static const double eV = electronvolt;
160 static const double keV = kiloelectronvolt;
161 static const double GeV = gigaelectronvolt;
162 static const double TeV = teraelectronvolt;
163 static const double PeV = petaelectronvolt;
164
165 //
166 // Mass [E][T^2][L^-2]
167 //
168 static const double kilogram = joule*second*second/(meter*meter);
169 static const double gram = 1.e-3*kilogram;
170 static const double milligram = 1.e-3*gram;
171
172 // symbols
173 static const double kg = kilogram;
174 static const double g = gram;
175 static const double mg = milligram;
176
177 //
178 // Power [E][T^-1]
179 //
180 static const double watt = joule/second; // watt = 6.24150 e+3 * MeV/ns
181
182 //
183 // Force [E][L^-1]
184 //
185 static const double newton = joule/meter; // newton = 6.24150 e+9 * MeV/mm
186
187 //
188 // Pressure [E][L^-3]
189 //
190 static const double Pa = newton/m2; // pascal = 6.24150 e+3 * MeV/mm3
191 static const double bar = 100000*Pa; // bar = 6.24150 e+8 * MeV/mm3
192 static const double atmosphere = 101325*Pa; // atm = 6.32420 e+8 * MeV/mm3
193
194 //
195 // Electric current [Q][T^-1]
196 //
197 static const double ampere = coulomb/second; // ampere = 6.24150 e+9 * eplus/ns
198 static const double milliampere = 1.e-3*ampere;
199 static const double microampere = 1.e-6*ampere;
200 static const double nanoampere = 1.e-9*ampere;
201
202 //
203 // Electric potential [E][Q^-1]
204 //
205 static const double megavolt = megaelectronvolt/eplus;
206 static const double kilovolt = 1.e-3*megavolt;
207 static const double volt = 1.e-6*megavolt;
208
209 //
210 // Electric resistance [E][T][Q^-2]
211 //
212 static const double ohm = volt/ampere; // ohm = 1.60217e-16*(MeV/eplus)/(eplus/ns)
213
214 //
215 // Electric capacitance [Q^2][E^-1]
216 //
217 static const double farad = coulomb/volt; // farad = 6.24150e+24 * eplus/Megavolt
218 static const double millifarad = 1.e-3*farad;
219 static const double microfarad = 1.e-6*farad;
220 static const double nanofarad = 1.e-9*farad;
221 static const double picofarad = 1.e-12*farad;
222
223 //
224 // Magnetic Flux [T][E][Q^-1]
225 //
226 static const double weber = volt*second; // weber = 1000*megavolt*ns
227
228 //
229 // Magnetic Field [T][E][Q^-1][L^-2]
230 //
231 static const double tesla = volt*second/meter2; // tesla =0.001*megavolt*ns/mm2
232
233 static const double gauss = 1.e-4*tesla;
234 static const double kilogauss = 1.e-1*tesla;
235
236 //
237 // Inductance [T^2][E][Q^-2]
238 //
239 static const double henry = weber/ampere; // henry = 1.60217e-7*MeV*(ns/eplus)**2
240
241 //
242 // Temperature
243 //
244 static const double kelvin = 1.;
245
246 //
247 // Amount of substance
248 //
249 static const double mole = 1.;
250
251 //
252 // Activity [T^-1]
253 //
254 static const double becquerel = 1./second ;
255 static const double curie = 3.7e+10 * becquerel;
256
257 //
258 // Absorbed dose [L^2][T^-2]
259 //
260 static const double gray = joule/kilogram ;
261
262 //
263 // Luminous intensity [I]
264 //
265 static const double candela = 1.;
266
267 //
268 // Luminous flux [I]
269 //
270 static const double lumen = candela*steradian;
271
272 //
273 // Illuminance [I][L^-2]
274 //
275 static const double lux = lumen/meter2;
276
277 //
278 // Miscellaneous
279 //
280 static const double perCent = 0.01 ;
281 static const double perThousand = 0.001;
282 static const double perMillion = 0.000001;
283
284 } // namespace Units
285 } // namespace Gaudi
286
287
288 #endif /* GAUDI_SYSTEM_OF_UNITS_H */