diff --git a/scimath/units/angle.py b/scimath/units/angle.py
index 52f71c5..a1e7609 100644
--- a/scimath/units/angle.py
+++ b/scimath/units/angle.py
@@ -36,6 +36,7 @@
 
 radian.label = 'rad'
 radians = radian
+rad = radian
 
 grad = degree * 0.9
 grad.label = '^g'
@@ -56,6 +57,7 @@
 revolution = 360 * degree
 revolution.label = 'r'
 revolutions = revolution
+rev = revolution
 circle = revolution
 circles = circle
 turn = circle
diff --git a/scimath/units/area.py b/scimath/units/area.py
index bd72a13..4940ef9 100644
--- a/scimath/units/area.py
+++ b/scimath/units/area.py
@@ -21,7 +21,9 @@
 #     fourth edition, John Willey and Sons, 1993
 
 square_meter = meter**2
+square_meter.label = 'm2'
 square_centimeter = centimeter**2
+square_centimeter.label = 'cm2'
 
 square_foot = foot**2
 square_inch = inch**2
@@ -35,6 +37,8 @@
 b = barn
 bn = barn
 barns = barn
+m2 = square_meter
+cm2 = square_centimeter
 
 # version
 __id__ = "$Id: area.py,v 1.1.1.1 2003/07/02 21:39:14 aivazis Exp $"
diff --git a/scimath/units/electromagnetism.py b/scimath/units/electromagnetism.py
index 2a2144e..72073e1 100644
--- a/scimath/units/electromagnetism.py
+++ b/scimath/units/electromagnetism.py
@@ -2,12 +2,19 @@
 from copy import copy
 
 from scimath.units.SI import ampere, coulomb, farad, henry, joule, ohm, \
-    meter, micro, milli, pico, siemens, tesla, volt, watt, weber
+    meter, micro, milli, pico, siemens, tesla, volt, watt, weber, kilo
+
+###############################################################################
+# electric charge
+###############################################################################
+
+C = coulomb
 
 ###############################################################################
 # electric current
 ###############################################################################
 
+A = ampere
 amp = ampere
 amps = ampere
 amperes = ampere
@@ -24,18 +31,27 @@
 
 volts = volt
 v = volt
+V = volt
 
 millivolt = milli * volt
-millivolt.label = 'mV'
+millivolt.label = 'mv'
 milli_volt = millivolt
 mv = millivolt
+mV = millivolt
 millivolts = millivolt
 
+kilovolt = kilo * volt
+kilovolt.label = 'kv'
+kv = kilovolt
+kV = kilovolt
+
 ###############################################################################
 # resistivity
 ###############################################################################
 
 ohms = ohm
+Ohm = ohm
+Ohms = ohms
 ohmm = ohm * meter
 ohmm.label = 'ohmm'
 ohm_m = ohmm
@@ -47,19 +63,24 @@
 # capacitance
 ###############################################################################
 
+F = farad
+
 micro_farad = micro * farad
 micro_farad.label = 'uf'
 mf = micro_farad
+mF = micro_farad
 
 pico_farad = pico * farad
 pico_farad.label = 'pf'
 pf = pico_farad
+pF = pico_farad
 
 ###############################################################################
 # conductivity
 ###############################################################################
 
 siemen = siemens
+S = siemens
 mSiemens = milli * siemens
 mSiemens.label = 'mS'
 mSiemen = mSiemens
@@ -80,15 +101,18 @@
 ###############################################################################
 
 henrys = henry
+H = henry
 
 ###############################################################################
 # Magnetic Flux
 ###############################################################################
 
 webers = weber
+Wb = weber
 
 ###############################################################################
 # Magnetic Field
 ###############################################################################
 
 teslas = tesla
+T = tesla
diff --git a/scimath/units/energy.py b/scimath/units/energy.py
index ac56167..c237563 100644
--- a/scimath/units/energy.py
+++ b/scimath/units/energy.py
@@ -12,7 +12,7 @@
 #
 
 from __future__ import absolute_import
-from .SI import joule, kilo, mega, giga
+from .SI import joule, kilo, mega, giga, tera, milli
 
 
 #
@@ -35,7 +35,7 @@
 
 calorie = 4.1858 * joule
 Calorie = 1000 * calorie
-kilowatt_hour = 3.6e6 * joule
+watt_hour = 3.6e3 * joule
 
 electron_volt = 1.60218e-19 * joule
 
@@ -43,8 +43,17 @@
 # aliases
 
 J = joule
-kJ = kilo * joule
-MJ = mega * joule
+millijoule = milli * joule
+kilojoule = kilo * joule
+megajoule = mega * joule
+gigajoule = giga * joule
+terajoule = tera * joule
+
+mJ = millijoule
+kJ = kilojoule
+MJ = megajoule
+GJ = gigajoule
+TJ = terajoule
 
 eV = electron_volt
 KeV = kilo * eV
@@ -52,7 +61,21 @@
 GeV = giga * eV
 
 cal = calorie
-kcal = kilo * calorie
+kilocalorie = kilo * calorie
+kcal = kilocalorie
+
+watt_second = joule
+kilowatt_hour = kilo * watt_hour
+megawatt_hour = mega * watt_hour
+gigawatt_hour = giga * watt_hour
+terawatt_hour = tera * watt_hour
+
+Ws = watt_second
+Wh = watt_hour
+kWh = kilowatt_hour
+MWh = megawatt_hour
+GWh = gigawatt_hour
+TWh = terawatt_hour
 
 
 # version
diff --git a/scimath/units/force.py b/scimath/units/force.py
index 2f3542e..de7ee71 100644
--- a/scimath/units/force.py
+++ b/scimath/units/force.py
@@ -13,9 +13,16 @@
 from __future__ import absolute_import
 from copy import copy
 
-from .SI import newton
+from .SI import newton, milli, kilo, mega
 
 N = newton
+millinewton = milli * newton
+kilonewton = kilo * newton
+meganewton = mega * newton
+
+mN = millinewton
+kN = kilonewton
+MN = meganewton
 
 lbf = 4.44822 * newton
 lbf.label = 'lbf'
diff --git a/scimath/units/frequency.py b/scimath/units/frequency.py
index f59ae2b..d7beb25 100644
--- a/scimath/units/frequency.py
+++ b/scimath/units/frequency.py
@@ -12,7 +12,7 @@
 # Date: 05/22/2005
 # Description: Define units of frequency
 #
-# Symbols defined: hz, khz
+# Symbols defined: hz, khz, kHz, MHz, GHz
 #
 #------------------------------------------------------------------------------
 
@@ -20,7 +20,7 @@
 # Imports:
 #############################################################################
 from __future__ import absolute_import
-from .SI import hertz, kilo
+from .SI import hertz, kilo, mega, giga
 from .time import minute
 
 #############################################################################
@@ -30,6 +30,10 @@
 hertz.label = 'Hz'
 kilohertz = kilo * hertz
 kilohertz.label = 'kHz'
+megahertz = mega * hertz
+megahertz.label = 'MHz'
+gigahertz = giga * hertz
+gigahertz.label = 'GHz'
 
 rpm = 1 / minute
 rpm.label = 'rpm'
@@ -42,5 +46,8 @@
 hz = hertz
 Hz = hertz
 khz = kilohertz
+kHz = kilohertz
+MHz = megahertz
+GHz = gigahertz
 
 #### EOF ######################################################################
diff --git a/scimath/units/power.py b/scimath/units/power.py
index 12de73a..24e715e 100644
--- a/scimath/units/power.py
+++ b/scimath/units/power.py
@@ -12,17 +12,34 @@
 #
 
 from __future__ import absolute_import
-from .SI import watt, kilo
+from .SI import watt, kilo, mega, giga, tera, milli
 
 #
 # Definitions of common power units
 # Data taken from Appendix F of Halliday, Resnick, Walker, "Fundamentals of Physics",
 #     fourth edition, John Willey and Sons, 1993
 
+milliwatt = milli * watt
+milliwatt.label = 'mW'
 kilowatt = kilo * watt
-kw = kilowatt
+kilowatt.label = 'kW'
+megawatt = mega * watt
+megawatt.label = 'MW'
+gigawatt = giga * watt
+gigawatt.label = 'GW'
+terawatt = tera * watt
+terawatt.label = 'TW'
 horsepower = 745.7 * watt
 
+# aliases
+
+mW = milliwatt
+W = watt
+kW = kilowatt
+MW = megawatt
+GW = gigawatt
+TW = terawatt
+
 
 # version
 __id__ = "$Id: power.py,v 1.1.1.1 2003/07/02 21:39:14 aivazis Exp $"
diff --git a/scimath/units/pressure.py b/scimath/units/pressure.py
index 5966d97..f92e1ae 100644
--- a/scimath/units/pressure.py
+++ b/scimath/units/pressure.py
@@ -12,7 +12,7 @@
 #
 
 from __future__ import absolute_import
-from .SI import pascal, kilo, mega, giga
+from .SI import pascal, hecto, kilo, mega, giga
 from scimath.units.force import lbf
 from scimath.units.length import inch
 from scimath.units.unit import unit
@@ -29,21 +29,27 @@
 
 
 # aliases
-
+pascal.label = 'Pa'
 Pa = pascal
-Pa.label = 'Pa'
 
-kPa = kilo * pascal
-kPa.label = 'kPa'
+hectopascal = hecto * pascal
+hectopascal.label = 'hPa'
+hPa = hectopascal
+
+kilopascal = kilo * pascal
+kilopascal.label = 'kPa'
+kPa = kilopascal
 
-MPa = mega * pascal
-MPa.label = 'MPa'
+megapascal = mega * pascal
+megapascal.label = 'MPa'
+MPa = megapascal
 mpa = MPa
 Mpa = MPa
 MPA = MPa
 
-GPa = giga * pascal
-GPa.label = 'GPa'
+gigapascal = giga * pascal
+gigapascal.label = 'GPa'
+GPa = gigapascal
 gpa = GPa
 Gpa = GPa
 GPA = GPa
@@ -61,10 +67,14 @@
 kbars = kbar
 
 millibar = 100 * pascal
+millibar.label = 'mbar'
+mbar = millibar
 
 torr = 133.3 * pascal
-atmosphere = 101325 * pascal
+torr.label = 'torr'
 
+atmosphere = 101325 * pascal
+atmosphere.label = 'atm'
 atm = atmosphere
 
 pounds_per_square_inch = lbf / inch ** 2
diff --git a/scimath/units/speed.py b/scimath/units/speed.py
index 5acf9e3..cae4352 100644
--- a/scimath/units/speed.py
+++ b/scimath/units/speed.py
@@ -27,8 +27,9 @@
 #############################################################################
 
 from __future__ import absolute_import
-from .time import hour, second, millisecond
+from .time import hour, minute, second, millisecond
 from .length import foot, kilometer, meter, nautical_mile, mile
+from .angle import radian, revolution
 
 #############################################################################
 # Definitions:
@@ -47,9 +48,22 @@
 meters_per_millisecond.label = 'm/msec'
 kilometers_per_second = kilometer / second
 kilometers_per_second.label = 'km/s'
+kilometers_per_hour = kilometer / hour
+kilometers_per_hour.label = 'km/h'
 miles_per_hour = mile / hour
 miles_per_hour.label = 'mph'
 
+# angular speeds
+radians_per_second = radian / second
+radians_per_second.label = 'rad/s'
+radians_per_minute = radian / minute
+radians_per_minute.label = 'rad/min'
+revolutions_per_second = revolution / second
+revolutions_per_second.label = 'rev/s'
+revolutions_per_minute = revolution / minute
+revolutions_per_minute.label = 'rev/min'
+rpm = revolutions_per_minute
+
 #############################################################################
 # Aliases:
 #############################################################################
diff --git a/scimath/units/time.py b/scimath/units/time.py
index 95d0abc..d2bd02a 100644
--- a/scimath/units/time.py
+++ b/scimath/units/time.py
@@ -76,8 +76,11 @@
 milliseconds = millisecond
 
 minutes = minute
+min = minute
 hours = hour
+h = hour
 days = day
+d = day
 weeks = week
 years = year
 
diff --git a/scimath/units/volume.py b/scimath/units/volume.py
index eb65013..f2d6695 100644
--- a/scimath/units/volume.py
+++ b/scimath/units/volume.py
@@ -73,13 +73,14 @@
 cm3 = cubic_centimeter
 cc = cm3
 
-m3 = V = cubic_meter
+m3 = cubic_meter
 
 f3 = cubic_foot
 ft3 = f3
 cuft = f3
 
 liters = liter
+l = liter
 
 bbl = barrel