# # Copyright (c) 1998 The Regenstrief Institute. All rights reserved. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. # # Author: Gunther Schadow. # # $Id: ISO2955-cs-fixed.units,v 1.1 1998/07/23 20:42:33 schadow Exp $ # ####################################################################### # # ISO 2955 SI AND OTHER UNITS (CASE SENSITIVE) # # NOTE: This is the origial specification except from a fixed # fatal bug where `a' stands for both are and year. We now use # `ar' for are. # # ASCII character set, no Omega, degree or mu # case sensitive # # 3. MULTIPLES OF SI-UNITS (PREFIXES) # # Table 5: # prefix E 1E18 # exa prefix P 1E15 # peta prefix T 1E12 # tera prefix G 1E9 # giga prefix M 1E6 # mega prefix k 1E3 # kilo prefix h 1E2 # hecto prefix da 1E1 # deka prefix d 1E-1 # deci prefix c 1E-2 # centi prefix m 1E-3 # milli prefix u 1E-6 # micro prefix n 1E-9 # nano prefix p 1E-12 # pico prefix f 1E-15 # fempto prefix a 1E-18 # atto # # Base SI units # dimensions 7 # base m # length metre base g # mass gram(*) base s # time second base A # electric current ampère base K # thermodynamic temperature kelvin base mol # amount of substance mole base cd # luminous intensity lumen # # *) SI wants kg instead of g as base unit for mass, yet, we # require bases to be atoms # # # Supplementary SI units # rad = 1 1 metric # plain angle radian sr = 1 1 metric # solid angle streadian # # Derived SI units with special names # Hz = 1 s-1 metric # frequency herz N = 1 kg.m/s2 metric # force newton Pa = 1 N/m2 metric # pressure, stress pascal J = 1 N.m metric # energy, work, joule # quantity of heat W = 1 J/s metric # power watt C = 1 A.s metric # electric charge coulomb # quantity of electricity V = 1 J/C metric # electric charge volt # potential difference # tension, electromotive force F = 1 C/V metric # electric capacitance farad Ohm = 1 V/A metric # electric resistance ohm S = 1 Ohm-1 metric # electric conductance siemens Wb = 1 V.s metric # flux of magnetic induction weber # magnetic flux T = 1 Wb/m2 metric # magnetic flux density tesla # magnetic induction H = 1 Wb/A metric # inductance henry Cel = cel(1 K) nonmetric # Celsius temperature degree Celsius lm = 1 cd.sr metric # luminous flux lumen lx = 1 lm/m2 metric # illuminance lux Bq = 1 s-1 metric # activity (of a radionuclide) becquerel Gy = 1 J/kg metric # absorbed dose, specific gray # energy imparted, kerma, # absorbed dose index Sv = 1 J/kg metric # dose equivalent sievert # # Other units from ISO 1000 # deg = .01745329251994329576 rad nonmetric # plane angle degree ' = 1 deg/60 nonmetric # plane angle minute '' = 1 '/60 nonmetric # plane angle second gon = .9 deg nonmetric # plane angle grade(*) l = 1 dm3 metric # volume litre L = 1 l metric ar = 100 m2 nonmetric # area are ha = 100 ar nonmetric # area hectare min = 60 s nonmetric # time minute h = 60 min nonmetric # time hour d = 24 h nonmetric # time day a = 365.2422 d nonmetric # time year(*,+) # ISO 2955 defines the gram here, which we did above t = 1e3 kg metric # mass tonne bar = 10e5 Pa metric # pressure of fluid bar P = 0.1 N.s/m2 metric # dynamic viscosity poise(*) St = 1 cm2/s metric # kinematic viscosity stokes(*) eV = 1.60219e-19 J metric # energy electronvolt u = 1.66053e-27 kg metric # mass of an atom atomic mass AU = 149597.870 Mm nonmetric # length astronomic unit pc = 206265 AU nonmetric # length parsec # # *) unit not listed in ISO 1000 # # +) assuming a mean solar year not a mean calendar year, which would # be 365.25 days. # # SUMMARY OF CONFLICTS: # # conflict: cd vs. c-d Type IVa (metric-nonmetric) # conflict: Pa vs. P-a Type IVa (metric-nonmetric) # conflict: ha vs. h-a Type III (nonmetric-nonmetric) #