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[Emacs-diffs] Changes to emacs/lisp/calc/calc-units.el


From: Jay Belanger
Subject: [Emacs-diffs] Changes to emacs/lisp/calc/calc-units.el
Date: Wed, 19 Oct 2005 16:16:14 -0400

Index: emacs/lisp/calc/calc-units.el
diff -c emacs/lisp/calc/calc-units.el:1.19 emacs/lisp/calc/calc-units.el:1.20
*** emacs/lisp/calc/calc-units.el:1.19  Sun Sep 18 12:42:35 2005
--- emacs/lisp/calc/calc-units.el       Wed Oct 19 20:16:14 2005
***************
*** 43,242 ****
  ;;; for CODATA 1998 see one of
  ;;; - Journal of Physical and Chemical Reference Data, 28(6), 1713-1852, 1999.
  ;;; - Reviews of Modern Physics, 72(2), 351-495, 2000.
  ;;; - http://physics.nist.gov/cuu/Constants/index.html
  
  (defvar math-standard-units
    '( ;; Length
!     ( m       nil                  "*Meter" )
!     ( in      "2.54 cm"             "Inch" )
!     ( ft      "12 in"              "Foot" )
!     ( yd      "3 ft"               "Yard" )
!     ( mi      "5280 ft"            "Mile" )
!     ( au      "149597870691 m"      "Astronomical Unit" ) ;; NASA JPL 
(http://neo.jpl.nasa.gov/glossary/au.html)
!     ( lyr     "9460536207068016 m"  "Light Year" )
!     ( pc      "206264.80625 au"     "Parsec" )
!     ( nmi     "1852 m"                     "Nautical Mile" )
!     ( fath    "6 ft"               "Fathom" )
!     ( u       "1 um"               "Micron" )
!     ( mil     "in/1000"            "Mil" )
!     ( point   "in/72"              "Point (1/72 inch)" )
!     ( tpt     "in/72.27"           "Point (TeX conventions)" )
!     ( Ang     "1e-10 m"            "Angstrom" )
!     ( mfi     "mi+ft+in"           "Miles + feet + inches" )
  
      ;; Area
!     ( hect    "10000 m^2"          "*Hectare" )
!     ( acre    "mi^2 / 640"         "Acre" )
!     ( b       "1e-28 m^2"          "Barn" )
  
      ;; Volume
!     ( l       "1e-3 m^3"           "*Liter" )
!     ( L       "1e-3 m^3"           "Liter" )
!     ( gal     "4 qt"               "US Gallon" )
!     ( qt      "2 pt"               "Quart" )
!     ( pt      "2 cup"              "Pint" )
!     ( cup     "8 ozfl"                     "Cup" )
!     ( ozfl    "2 tbsp"                     "Fluid Ounce" )
!     ( floz    "2 tbsp"                     "Fluid Ounce" )
!     ( tbsp    "3 tsp"              "Tablespoon" )
!     ( tsp     "4.92892159375 ml"    "Teaspoon" )
      ( vol     "tsp+tbsp+ozfl+cup+pt+qt+gal" "Gallons + ... + teaspoons" )
!     ( galC    "4.54609 l"          "Canadian Gallon" )
!     ( galUK   "4.546092 l"         "UK Gallon" )
  
      ;; Time
!     ( s       nil                  "*Second" )
!     ( sec     "s"                  "Second" )
!     ( min     "60 s"               "Minute" )
!     ( hr      "60 min"                     "Hour" )
!     ( day     "24 hr"              "Day" )
!     ( wk      "7 day"              "Week" )
!     ( hms     "wk+day+hr+min+s"     "Hours, minutes, seconds" )
!     ( yr      "365.25 day"         "Year" )
!     ( Hz      "1/s"                "Hertz" )
  
      ;; Speed
!     ( mph     "mi/hr"              "*Miles per hour" )
!     ( kph     "km/hr"              "Kilometers per hour" )
!     ( knot    "nmi/hr"                     "Knot" )
!     ( c       "2.99792458e8 m/s"    "Speed of light" )
  
      ;; Acceleration
!     ( ga      "9.80665 m/s^2"      "*\"g\" acceleration" )
  
      ;; Mass
!     ( g       nil                   "*Gram" )
!     ( lb      "16 oz"              "Pound (mass)" )
!     ( oz      "28.349523125 g"             "Ounce (mass)" )
!     ( ton     "2000 lb"            "Ton" )
!     ( tpo     "ton+lb+oz"          "Tons + pounds + ounces (mass)" )
!     ( t       "1000 kg"            "Metric ton" )
!     ( tonUK   "1016.0469088 kg"     "UK ton" )
!     ( lbt     "12 ozt"                     "Troy pound" )
!     ( ozt     "31.103475 g"        "Troy ounce" )
!     ( ct      ".2 g"               "Carat" )
!     ( amu     "1.66053873e-27 kg"   "Unified atomic mass" ) ;; CODATA 1998
  
      ;; Force
!     ( N       "m kg/s^2"           "*Newton" )
!     ( dyn     "1e-5 N"                     "Dyne" )
!     ( gf      "ga g"               "Gram (force)" )
!     ( lbf     "4.44822161526 N"     "Pound (force)" )
!     ( kip     "1000 lbf"           "Kilopound (force)" )
!     ( pdl     "0.138255 N"         "Poundal" )
  
      ;; Energy
!     ( J       "N m"                "*Joule" )
!     ( erg     "1e-7 J"                     "Erg" )
!     ( cal     "4.1868 J"           "International Table Calorie" )
!     ( Btu     "1055.05585262 J"     "International Table Btu" )
!     ( eV      "ech V"               "Electron volt" )
!     ( ev      "eV"                  "Electron volt" )
!     ( therm   "105506000 J"        "EEC therm" )
!     ( invcm   "h c/cm"                     "Energy in inverse centimeters" )
!     ( Kayser  "invcm"              "Kayser (inverse centimeter energy)" )
!     ( men     "100/invcm"          "Inverse energy in meters" )
!     ( Hzen    "h Hz"               "Energy in Hertz")
!     ( Ken     "k K"                "Energy in Kelvins")
      ( Wh      "W hr"                 "Watt hour")
!     ( Ws      "W s"                 "Watt second")
  
      ;; Power
!     ( W       "J/s"                "*Watt" )
!     ( hp      "745.7 W"            "Horsepower" )
  
      ;; Temperature
!     ( K       nil                   "*Degree Kelvin"     K )
!     ( dK      "K"                  "Degree Kelvin"      K )
!     ( degK    "K"                  "Degree Kelvin"      K )
!     ( dC      "K"                  "Degree Celsius"     C )
!     ( degC    "K"                  "Degree Celsius"     C )
!     ( dF      "(5/9) K"            "Degree Fahrenheit"  F )
!     ( degF    "(5/9) K"            "Degree Fahrenheit"  F )
  
      ;; Pressure
!     ( Pa      "N/m^2"              "*Pascal" )
!     ( bar     "1e5 Pa"                     "Bar" )
!     ( atm     "101325 Pa"          "Standard atmosphere" )
!     ( torr    " 1.333224e2 Pa"             "Torr" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( mHg     "1000 torr"          "Meter of mercury" )
!     ( inHg    "25.4 mmHg"          "Inch of mercury" )
!     ( inH2O   "2.490889e2 Pa"      "Inch of water" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( psi     "6894.75729317 Pa"    "Pound per square inch" )
  
      ;; Viscosity
!     ( P       "0.1 Pa s"           "*Poise" )
!     ( St      "1e-4 m^2/s"         "Stokes" )
  
      ;; Electromagnetism
!     ( A       nil                   "*Ampere" )
!     ( C       "A s"                "Coulomb" )
!     ( Fdy     "ech Nav"            "Faraday" )
!     ( e       "1.602176462e-19 C"   "Elementary charge" ) ;; CODATA 1998
!     ( ech     "1.602176462e-19 C"   "Elementary charge" ) ;; CODATA 1998
!     ( V       "W/A"                "Volt" )
!     ( ohm     "V/A"                "Ohm" )
!     ( mho     "A/V"                "Mho" )
!     ( S       "A/V"                "Siemens" )
!     ( F       "C/V"                "Farad" )
!     ( H       "Wb/A"               "Henry" )
!     ( T       "Wb/m^2"                     "Tesla" )
!     ( G       "1e-4 T"                     "Gauss" )
!     ( Wb      "V s"                "Weber" )
  
      ;; Luminous intensity
!     ( cd      nil                   "*Candela" )
!     ( sb      "1e4 cd/m^2"         "Stilb" )
!     ( lm      "cd sr"              "Lumen" )
!     ( lx      "lm/m^2"                     "Lux" )
!     ( ph      "1e4 lx"                     "Phot" )
!     ( fc      "10.76391 lx"        "Footcandle" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( lam     "1e4 lm/m^2"         "Lambert" )
!     ( flam    "3.426259 cd/m^2"     "Footlambert" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
  
      ;; Radioactivity
!     ( Bq      "1/s"                "*Becquerel" )
!     ( Ci      "3.7e10 Bq"          "Curie" )
!     ( Gy      "J/kg"               "Gray" )
!     ( Sv      "Gy"                 "Sievert" )
!     ( R       "2.58e-4 C/kg"       "Roentgen" )
!     ( rd      ".01 Gy"                     "Rad" )
!     ( rem     "rd"                 "Rem" )
  
      ;; Amount of substance
!     ( mol     nil                   "*Mole" )
  
      ;; Plane angle
!     ( rad     nil                   "*Radian" )
!     ( circ    "2 pi rad"           "Full circle" )
!     ( rev     "circ"               "Full revolution" )
!     ( deg     "circ/360"            "Degree" )
!     ( arcmin  "deg/60"                     "Arc minute" )
!     ( arcsec  "arcmin/60"          "Arc second" )
!     ( grad    "circ/400"            "Grade" )
!     ( rpm     "rev/min"            "Revolutions per minute" )
  
      ;; Solid angle
!     ( sr      nil                  "*Steradian" )
  
!     ;; Other physical quantities (CODATA 1998)
!     ( h       "6.62606876e-34 J s"     "*Planck's constant" )
      ( hbar    "h / 2 pi"               "Planck's constant" )
      ( mu0     "4 pi 1e-7 H/m"          "Permeability of vacuum" )
!     ( Grav    "6.673e-11 m^3/kg^1/s^2" "Gravitational constant" )
!     ( Nav     "6.02214199e23 / mol"    "Avagadro's constant" )
!     ( me      "9.10938188e-31 kg"      "Electron rest mass" )
!     ( mp      "1.67262158e-27 kg"      "Proton rest mass" )
!     ( mn      "1.67492716e-27 kg"      "Neutron rest mass" )
!     ( mu      "1.88353109e-28 kg"      "Muon rest mass" )
!     ( Ryd     "10973731.568549 /m"     "Rydberg's constant" )
!     ( k       "1.3806503e-23 J/K"      "Boltzmann's constant" )
!     ( fsc     "7.297352533e-3"         "Fine structure constant" )
!     ( muB     "927.400899e-26 J/T"     "Bohr magneton" )
!     ( muN     "5.05078317e-27 J/T"     "Nuclear magneton" )
!     ( mue     "-928.476362e-26 J/T"    "Electron magnetic moment" )
!     ( mup     "1.410606633e-26 J/T"    "Proton magnetic moment" )
!     ( R0      "8.314472 J/mol/K"       "Molar gas constant" )
      ( V0      "22.710981e-3 m^3/mol"   "Standard volume of ideal gas" )))
  
  
--- 43,250 ----
  ;;; for CODATA 1998 see one of
  ;;; - Journal of Physical and Chemical Reference Data, 28(6), 1713-1852, 1999.
  ;;; - Reviews of Modern Physics, 72(2), 351-495, 2000.
+ ;;; for CODATA 2005 see
  ;;; - http://physics.nist.gov/cuu/Constants/index.html
  
  (defvar math-standard-units
    '( ;; Length
!     ( m       nil                    "*Meter" )
!     ( in      "2.54 cm"           "Inch" )
!     ( ft      "12 in"                "Foot" )
!     ( yd      "3 ft"                 "Yard" )
!     ( mi      "5280 ft"              "Mile" )
!     ( au      "149597870691 m"       "Astronomical Unit" ) ;; NASA JPL 
(http://neo.jpl.nasa.gov/glossary/au.html)
!     ( lyr     "9460536207068016 m"   "Light Year" )
!     ( pc      "206264.80625 au"      "Parsec" )
!     ( nmi     "1852 m"               "Nautical Mile" )
!     ( fath    "6 ft"                 "Fathom" )
!     ( mu      "1 um"                 "Micron" )
!     ( mil     "in/1000"              "Mil" )
!     ( point   "in/72"                "Point (1/72 inch)" )
!     ( Ang     "1e-10 m"              "Angstrom" )
!     ( mfi     "mi+ft+in"             "Miles + feet + inches" )
!     ;; TeX lengths
!     ( texpt   "in/72.27"             "Point (TeX conventions)" )
!     ( texpc   "12 texpt"             "Pica" )
!     ( texbp   "point"                "Big point (TeX conventions)" )
!     ( texdd   "1238/1157 texpt"      "Didot point" )
!     ( texcc   "12 texdd"             "Cicero" )
!     ( texsp   "1/66536 texpt"        "Scaled TeX point" )
  
      ;; Area
!     ( hect    "10000 m^2"            "*Hectare" )
!     ( a       "100 m^2"              "Are")
!     ( acre    "mi^2 / 640"           "Acre" )
!     ( b       "1e-28 m^2"            "Barn" )
  
      ;; Volume
!     ( L       "1e-3 m^3"             "*Liter" )
!     ( l       "L"                    "Liter" )
!     ( gal     "4 qt"                 "US Gallon" )
!     ( qt      "2 pt"                 "Quart" )
!     ( pt      "2 cup"                "Pint" )
!     ( cup     "8 ozfl"               "Cup" )
!     ( ozfl    "2 tbsp"               "Fluid Ounce" )
!     ( floz    "2 tbsp"               "Fluid Ounce" )
!     ( tbsp    "3 tsp"                "Tablespoon" )
!     ( tsp     "4.92892159375 ml"     "Teaspoon" )
      ( vol     "tsp+tbsp+ozfl+cup+pt+qt+gal" "Gallons + ... + teaspoons" )
!     ( galC    "4.54609 L"            "Canadian Gallon" )
!     ( galUK   "4.546092 L"           "UK Gallon" )
  
      ;; Time
!     ( s       nil                    "*Second" )
!     ( sec     "s"                    "Second" )
!     ( min     "60 s"                 "Minute" )
!     ( hr      "60 min"               "Hour" )
!     ( day     "24 hr"                "Day" )
!     ( wk      "7 day"                "Week" )
!     ( hms     "wk+day+hr+min+s"      "Hours, minutes, seconds" )
!     ( yr      "365.25 day"           "Year" )
!     ( Hz      "1/s"                  "Hertz" )
  
      ;; Speed
!     ( mph     "mi/hr"                "*Miles per hour" )
!     ( kph     "km/hr"                "Kilometers per hour" )
!     ( knot    "nmi/hr"               "Knot" )
!     ( c       "299792458 m/s"        "Speed of light" ) ;;; CODATA 2005
  
      ;; Acceleration
!     ( ga      "9.80665 m/s^2"        "*\"g\" acceleration" ) ;; CODATA 2005
  
      ;; Mass
!     ( g       nil                    "*Gram" )
!     ( lb      "16 oz"                "Pound (mass)" )
!     ( oz      "28.349523125 g"       "Ounce (mass)" )
!     ( ton     "2000 lb"              "Ton" )
!     ( tpo     "ton+lb+oz"            "Tons + pounds + ounces (mass)" )
!     ( t       "1000 kg"              "Metric ton" )
!     ( tonUK   "1016.0469088 kg"      "UK ton" )
!     ( lbt     "12 ozt"               "Troy pound" )
!     ( ozt     "31.103475 g"          "Troy ounce" )
!     ( ct      ".2 g"                 "Carat" )
!     ( u       "1.66053886e-27 kg"    "Unified atomic mass" ) ;; CODATA 2005
  
      ;; Force
!     ( N       "m kg/s^2"             "*Newton" )
!     ( dyn     "1e-5 N"               "Dyne" )
!     ( gf      "ga g"                 "Gram (force)" )
!     ( lbf     "4.44822161526 N"      "Pound (force)" )
!     ( kip     "1000 lbf"             "Kilopound (force)" )
!     ( pdl     "0.138255 N"           "Poundal" )
  
      ;; Energy
!     ( J       "N m"                  "*Joule" )
!     ( erg     "1e-7 J"               "Erg" )
!     ( cal     "4.1868 J"             "International Table Calorie" )
!     ( Btu     "1055.05585262 J"      "International Table Btu" )
!     ( eV      "ech V"                "Electron volt" )
!     ( ev      "eV"                   "Electron volt" )
!     ( therm   "105506000 J"          "EEC therm" )
!     ( invcm   "h c/cm"               "Energy in inverse centimeters" )
!     ( Kayser  "invcm"                "Kayser (inverse centimeter energy)" )
!     ( men     "100/invcm"            "Inverse energy in meters" )
!     ( Hzen    "h Hz"                 "Energy in Hertz")
!     ( Ken     "k K"                  "Energy in Kelvins")
      ( Wh      "W hr"                 "Watt hour")
!     ( Ws      "W s"                  "Watt second")
  
      ;; Power
!     ( W       "J/s"                  "*Watt" )
!     ( hp      "745.7 W"              "Horsepower" )
  
      ;; Temperature
!     ( K       nil                    "*Degree Kelvin"     K )
!     ( dK      "K"                    "Degree Kelvin"      K )
!     ( degK    "K"                    "Degree Kelvin"      K )
!     ( dC      "K"                    "Degree Celsius"     C )
!     ( degC    "K"                    "Degree Celsius"     C )
!     ( dF      "(5/9) K"              "Degree Fahrenheit"  F )
!     ( degF    "(5/9) K"              "Degree Fahrenheit"  F )
  
      ;; Pressure
!     ( Pa      "N/m^2"                "*Pascal" )
!     ( bar     "1e5 Pa"               "Bar" )
!     ( atm     "101325 Pa"            "Standard atmosphere" ) ;; CODATA 2005
!     ( Torr    " 1.333224e2 Pa"       "Torr" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( mHg     "1000 Torr"            "Meter of mercury" )
!     ( inHg    "25.4 mmHg"            "Inch of mercury" )
!     ( inH2O   "2.490889e2 Pa"        "Inch of water" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( psi     "6894.75729317 Pa"     "Pound per square inch" )
  
      ;; Viscosity
!     ( P       "0.1 Pa s"              "*Poise" )
!     ( St      "1e-4 m^2/s"            "Stokes" )
  
      ;; Electromagnetism
!     ( A       nil                     "*Ampere" )
!     ( C       "A s"                   "Coulomb" )
!     ( Fdy     "ech Nav"               "Faraday" )
!     ( e       "1.60217653e-19 C"      "Elementary charge" ) ;; CODATA 2005
!     ( ech     "1.60217653e-19 C"      "Elementary charge" ) ;; CODATA 2005
!     ( V       "W/A"                   "Volt" )
!     ( ohm     "V/A"                   "Ohm" )
!     ( mho     "A/V"                   "Mho" )
!     ( S       "A/V"                   "Siemens" )
!     ( F       "C/V"                   "Farad" )
!     ( H       "Wb/A"                  "Henry" )
!     ( T       "Wb/m^2"                "Tesla" )
!     ( Gs      "1e-4 T"                "Gauss" )
!     ( Wb      "V s"                   "Weber" )
  
      ;; Luminous intensity
!     ( cd      nil                     "*Candela" )
!     ( sb      "1e4 cd/m^2"            "Stilb" )
!     ( lm      "cd sr"                 "Lumen" )
!     ( lx      "lm/m^2"                "Lux" )
!     ( ph      "1e4 lx"                "Phot" )
!     ( fc      "10.76391 lx"           "Footcandle" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
!     ( lam     "1e4 lm/m^2"            "Lambert" )
!     ( flam    "3.426259 cd/m^2"       "Footlambert" ) ;; NIST 
(http://physics.nist.gov/Pubs/SP811/appenB9.html)
  
      ;; Radioactivity
!     ( Bq      "1/s"                    "*Becquerel" )
!     ( Ci      "3.7e10 Bq"              "Curie" )
!     ( Gy      "J/kg"                   "Gray" )
!     ( Sv      "Gy"                     "Sievert" )
!     ( R       "2.58e-4 C/kg"           "Roentgen" )
!     ( rd      ".01 Gy"                 "Rad" )
!     ( rem     "rd"                     "Rem" )
  
      ;; Amount of substance
!     ( mol     nil                      "*Mole" )
  
      ;; Plane angle
!     ( rad     nil                      "*Radian" )
!     ( circ    "2 pi rad"               "Full circle" )
!     ( rev     "circ"                   "Full revolution" )
!     ( deg     "circ/360"               "Degree" )
!     ( arcmin  "deg/60"                 "Arc minute" )
!     ( arcsec  "arcmin/60"              "Arc second" )
!     ( grad    "circ/400"               "Grade" )
!     ( rpm     "rev/min"                "Revolutions per minute" )
  
      ;; Solid angle
!     ( sr      nil                      "*Steradian" )
  
!     ;; Other physical quantities
!     ( h       "6.6260693e-34 J s"     "*Planck's constant" ) ;; CODATA 2005
      ( hbar    "h / 2 pi"               "Planck's constant" )
      ( mu0     "4 pi 1e-7 H/m"          "Permeability of vacuum" )
!     ( G       "6.6742e-11 m^3/kg^1/s^2" "Gravitational constant" ) ;; CODATA 
2005
!     ( Nav     "6.02214115e23 / mol"    "Avagadro's constant" ) ;; CODATA 2005
!     ( me      "9.1093826e-31 kg"       "Electron rest mass" ) ;; CODATA 2005
!     ( mp      "1.67262171e-27 kg"      "Proton rest mass" ) ;; CODATA 2005
!     ( mn      "1.67492728e-27 kg"      "Neutron rest mass" ) ;; CODATA 2005
!     ( mmu     "1.88353140e-28 kg"      "Muon rest mass" ) ;; CODATA 2005
!     ( Ryd     "10973731.568525 /m"     "Rydberg's constant" ) ;; CODATA 2005
!     ( k       "1.3806505e-23 J/K"      "Boltzmann's constant" ) ;; CODATA 2005
!     ( alpha   "7.297352568e-3"         "Fine structure constant" ) ;; CODATA 
2005
!     ( muB     "927.400949e-26 J/T"     "Bohr magneton" ) ;; CODATA 2005
!     ( muN     "5.05078343e-27 J/T"     "Nuclear magneton" ) ;; CODATA 2005
!     ( mue     "-928.476412e-26 J/T"    "Electron magnetic moment" ) ;; CODATA 
2005
!     ( mup     "1.41060671e-26 J/T"     "Proton magnetic moment" ) ;; CODATA 
2005
!     ( R0      "8.314472 J/mol/K"       "Molar gas constant" ) ;; CODATA 2005
      ( V0      "22.710981e-3 m^3/mol"   "Standard volume of ideal gas" )))
  
  
***************
*** 247,253 ****
  that the combined units table will be rebuilt.")
  
  (defvar math-unit-prefixes
!   '( ( ?E  (float 1 18)  "Exa"    )
       ( ?P  (float 1 15)  "Peta"   )
       ( ?T  (float 1 12)  "Tera"         )
       ( ?G  (float 1 9)   "Giga"         )
--- 255,263 ----
  that the combined units table will be rebuilt.")
  
  (defvar math-unit-prefixes
!   '( ( ?Y  (float 1 24)  "Yotta"  )
!      ( ?Z  (float 1 21)  "Zetta"  )
!      ( ?E  (float 1 18)  "Exa"    )
       ( ?P  (float 1 15)  "Peta"   )
       ( ?T  (float 1 12)  "Tera"         )
       ( ?G  (float 1 9)   "Giga"         )
***************
*** 265,271 ****
       ( ?n  (float 1 -9)  "Nano"         )
       ( ?p  (float 1 -12) "Pico"         )
       ( ?f  (float 1 -15) "Femto"  )
!      ( ?a  (float 1 -18) "Atto"   )))
  
  (defvar math-standard-units-systems
    '( ( base  nil )
--- 275,283 ----
       ( ?n  (float 1 -9)  "Nano"         )
       ( ?p  (float 1 -12) "Pico"         )
       ( ?f  (float 1 -15) "Femto"  )
!      ( ?a  (float 1 -18) "Atto"   )
!      ( ?z  (float 1 -21) "zepto"  )
!      ( ?y  (float 1 -24) "yocto"  )))
  
  (defvar math-standard-units-systems
    '( ( base  nil )




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