# The LearningOnline Network with CAPA # Physical Unit definitions # # $Id: capa.units,v 1.17 2011/06/08 20:29:04 www Exp $ # # Copyright Michigan State University Board of Trustees # # This file is part of the LearningOnline Network with CAPA (LON-CAPA). # # LON-CAPA 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. # # LON-CAPA 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 LON-CAPA; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # # /home/httpd/html/adm/gpl.txt # # http://www.lon-capa.org/ # # # ======================= Unit section ============= # Base Unit # name symbol comment << Base Unit >> meter m # length kilogram kg # mass second s # time ampere A # electric current kelvin K # thermodynamic temperature mole mol # amount of substance candela cd # luminous intensity decibel dB # log of pressure amplitude # Prefix symbol factor << Prefix >> yotta Y 10^{24} zetta Z 10^{21} exa E 10^{18} peta P 10^{15} tera T 10^{12} giga G 10^9 mega M 10^6 kilo k 10^3 hecto h 10^2 deca D 10^1 deci d 10^-1 centi c 10^-2 milli m 10^-3 micro u 10^-6 nano n 10^-9 pico p 10^{-12} femto f 10^{-15} atto a 10^{-18} zepto z 10^{-21} yocto y 10^{-24} # Derived Unit # name symbol unit comment # name must be in oneword <> gram g 0.001 kg # mass minute min 60 s # time hour hr 3600. s # time hour h 3600. s # time day day 24.0 hr # time day days 24.0 hr # time year yr 365.24 day # time pound lb 0.45359237 kg # mass ounce oz 2.83495E-2 kg # mass inch in 2.54 cm # length foot ft 12 in # length mile mi 5280 ft # length yard yd 0.9144 m # length nautical_mile n_mi 6080 ft # length, nautical mile (UK) rood rood 1210 yd^2 # area, rood acre acre 4840 yd^2 # area, acre hertz Hz 1/s # frequency litre L 10^3*cm^3 # volume newton N m*kg/s^2 # force pound_force lbf 4.44822 N # force dyne dyn 1E-5 N # force pascal Pa N/m^2 # pressure, stress bar bar 1E5 Pa # pressure mmHg mmHg 1.33322E2 Pa # pressure, millimeter of mercury torr torr 1 mmHg # pressure atm atm 760 torr # standard atmosphere joule J N*m # energy, work, heat electronvolt eV 1.6021892E-19 J # energy calorie cal 4.1868 J # energy Btu Btu 1.05506E3 J # energy watt W J/s # power, radiant flux coulomb C A*s # electric charge volt V J/C # electric potential, electromotive force ohm ohm V/A # electric resistance, use this in /ANS ohm ohms V/A # electric resistance ohm Ohm V/A # electric resistance ohm Ohms V/A # electric resistance mho mho 1/ohm # electric conductance mho mhos 1/ohm # electric conductance mho Mho 1/ohm # electric conductance mho Mhos 1/ohm # electric conductance siemens S 1/Ohm # electric conductance farad F C/V # electric capacitance tesla T V*s/m^2 # magnetic flux density weber Wb V*s # magnetic flux henry H V*s/A # inductance radian rad m/m # plane angle degree deg 1.745329E-2 rad # plane angle (Pi rad=180 deg) steradian sr m^2 /m^2 # solid angle lumen lm cd*sr # luminous flux lux lx cd*sr/m^2 # illuminance becquerel Bq 1/s # activity (radioactive) curie Ci 3.70E10 Bq # activity (radioactive) gray Gy J/kg # absorbed dose (of radiation) sievert Sv J/kg # dose equivalent (dose equivalent index) astroUnit AU 1.49598E11 m # mean distance earth to sun celcius degC 1 K # multiplicatively OK fahrenheit degF 0.555555555 K # multiplicatively OK molarity M mol/L # chemisty amu amu 1.66053873e-27 kg # atomic mass unit amu u 1.66053873e-27 kg # atomic mass unit lightspeed c 299792458 m/s # speed of light cubiccentimeter cc cm^3 # cubic centimeter electroncharge e 1.6021892E-19 C # elementary charge hbar hbar 1.05457148E-34 m^2*kg/s # Planck constant milesperhour mph 0.44704 m/s # miles per hour rpm rpm 0.0166666667/s # rounds per minute rpm rpms 0.0166666667/s # rounds per minute parsec pc 3.08568025E16 m # parsec