• M (mega) = 1000000 (prefix)
• m (meter) = m (length; base unit)
• m (milli) = 0.001 (prefix)
• ma (myria) = 10000 (prefix)
• Ma = mach (velocity)
• mach (Mach at sea level & 32 dF) = 331.46 m/s (velocity)
• Magnetic Dipole Moment
  • magnetic dipole moment = J*m/A (category unit)
• magnetic dipole moment = J*m/A (magnetic dipole moment; category unit)
• magnetic field (constant) = 0.0000004 pi*H/m (permeability)
• Magnetic Field Strength
  • linear current density = magnetic field strength
  • linear electric current density = magnetic field strength
  • magnetic field strength = A/m (category unit)
  • magnetic intensity = magnetic field strength
  • magnetization = magnetic field strength
  • Oe = oersted
  • oersted = 79.5774715459477 A/m
• magnetic field strength = A/m (magnetic field strength; category unit)
• Magnetic Flux
  • amount of magnetization = magnetic flux
  • flux linkage = magnetic flux
  • magnetic flux = Wb (category unit)
  • magnetic mass = magnetic flux
  • maxwell = 0.00000001 Wb
  • Mx = maxwell
  • Wb = weber
  • weber = V*s (derived unit)
• magnetic flux = Wb (magnetic flux; category unit)
• Magnetic Flux Density
  • G = gauss
  • gamma = 0.000000001 T
  • gauss = 0.0001 T
  • magnetic flux density = T (category unit)
  • magnetic induction flux = magnetic flux density
  • magnetic polarization = magnetic flux density
  • T = tesla
  • tesla = kg/A*s^2 (derived unit)
• magnetic flux density = T (magnetic flux density; category unit)
• Magnetic Force
  • ampere turn = A*turn (derived unit)
  • At = ampere turn
  • gilbert = 0.795775 ampere turn
  • magnetic force = ampere turn (category unit)
  • magnetic potential = magnetic force
  • magnetomotive force = magnetic force
• magnetic force = ampere turn (magnetic force; category unit)
• magnetic induction flux = magnetic flux density (magnetic flux density)
• magnetic intensity = magnetic field strength (magnetic field strength)
• magnetic mass = magnetic flux (magnetic flux)
• magnetic moment = electromagnetic moment (electromagnetic moment)
• magnetic permeability = permeability (permeability)
• magnetic polarization = magnetic flux density (magnetic flux density)
• magnetic potential = magnetic force (magnetic force)
• magnetic potential difference = electric current (electric current)
• Magnetic Vector Potential
  • magnetic vector potential = Wb/m (category unit)
• magnetic vector potential = Wb/m (magnetic vector potential; category unit)
• magnetization = magnetic field strength (magnetic field strength)
• magnetomotive force = magnetic force (magnetic force)
• magnum = 2 quart (volume)
• marathon = 46145 yard (length)
• marine league = nautical league (length)
• Mass
  • AMU (atomic mass unit) = 1.66044E-27 kg*approx
  • ap dr = dram ap
  • ap dram = dram ap
  • ap gr = grain ap
  • ap grain = grain ap
  • ap lb = pound ap
  • ap oz = oz ap
  • ap pound = pound ap
  • ap scruple = scruple
  • arroba (Mexican arroba) = 26.367 pound
  • as (Roman as) = 12 uncia
  • assay ton = 29.167 gram
  • AT = assay ton
  • atomic mass = AMU
  • atomic mass unit = AMU
  • Babylonian shekel = 8.37 gram
  • bag = 94 pound
  • bes (Roman bes) = 0.48 pound
  • bowling ball = 16 pound
  • carat = carat troy
  • carat t = carat troy
  • carat troy (troy carat) = 0.0002 kg
  • catty (Chinese catty) = 1.33333333333333 pound
  • cental (British cental) = 100 pound
  • chin = catty
  • cotton bale (US) = 500 pound
  • cotton bale Egypt = 750 pound
  • crith = 0.0906 gram
  • ct = carat troy
  • cwt = short hundredweight
  • dalton = AMU
  • deadweight ton = long ton
  • denarius (Roman denarius) = 60 grain
  • dinar (Arabian dinar) = 4.2 gram
  • doppelzentner = 100 kg
  • dr = dram
  • dr ap = dram ap
  • dr t = dram troy
  • drachma2 (Greek drachma) = 4.2923 gram
  • dram (avoirdupois dram) = 0.0625 oz
  • dram ap (apothecary dram) = 3 scruple
  • dram troy (troy dram) = 60 grain
  • dw t = pennyweight troy
  • earth mass = 5.983E+24 kg*approx
  • electron mass (electron rest mass) = 9.109558E-31 kg
  • English carat = 0.000205 kg
  • funt (Russian funt) = 0.9 pound
  • gm = gram
  • gr = grain
  • gr ap = grain ap
  • gr t = grain troy
  • grain (avoirdupois grain) = 1.42857142857143E-04 pound
  • grain ap (apothecary grain) = grain
  • grain troy (troy grain) = grain
  • gram = 0.001 kg
  • Greek obolos = 715.38 milligram
  • gross cwt = long hundredweight
  • gross hundredweight = long hundredweight
  • gross ton = long ton
  • hundredweight = short hundredweight
  • hyl = gf*s^2/m (derived unit)
  • Israeli shekel mass = 14.1 gram
  • key = kg
  • kg (kilogram) = kg (base unit)
  • kin (Japanese kin) = 1.323 pound
  • kwan (Japanese kwan) = 8.27 pound
  • lb = pound
  • lb ap = pound ap
  • lb t = pound troy
  • lb troy = pound troy
  • liang = tael
  • libra (Roman libra) = as
  • librae = libra
  • livre (French livre) = 490 gram
  • long hundredweight (avoirdupois long hundredweight) = 112 pound
  • long quarter = 28 pound
  • long ton (avoirdupois long ton) = 2240 pound
  • mass = kg (category unit)
  • me = electron mass
  • metric ton = 1000 kg
  • Mexican libra = 1.015 pound
  • mg (milligram) = milligram
  • mina (Greek mina) = 0.9463 pound
  • mite (English mite) = 0.05 grain
  • mn = neutron mass
  • mp = proton mass
  • net hundredweight = short hundredweight
  • net ton = short ton
  • neutron mass (neutron rest mass) = 1.67492E-27 kg
  • obol (Greek obol) = 11.2 grain
  • oz (avoirdupois ounce) = 0.0625 pound
  • oz ap (apothecary ounce) = 8 dram ap
  • oz t = oz troy
  • oz troy (troy ounce) = 480 grain
  • pennyweight = pennyweight troy
  • pennyweight troy (troy pennyweight) = 24 grain
  • pfund (German pfund) = 500 gram
  • picul (Chinese picul) = 100 catty
  • pondus (Roman pondus) = as
  • pood (Russian pood) = 36.11 pound
  • pound (avoirdupois pound) = 0.45359237 kg
  • pound ap (apothecary pound) = 12 oz ap
  • pound t = pound troy
  • pound troy (troy pound) = 12 oz troy
  • proton mass (proton rest mass) = 1.672614E-27 kg
  • quintal = 100 kg
  • Roman obolus = 8.77 grain
  • Roman talent = 125 libra
  • s ap = scruple
  • scruple (apothecary scruple) = 20 grain
  • scruple ap = scruple
  • scrupulum (Roman scrupulum) = 17.53 grain
  • short hundredweight (avoirdupois short hundredweight) = 100 pound
  • short quarter = 25 pound
  • short ton (avoirdupois short ton) = 2000 pound
  • slug = lbf*s^2/ft (derived unit)
  • Spanish libra = 1.014 pound
  • Spanish quintal = 101.4 pound
  • stone = 14 pound
  • t = metric ton
  • tael (Chinese tael) = 0.0625 catty
  • talent (Greek talent) = 60 mina
  • tan = picul
  • tn = short ton
  • ton = short ton
  • tonne = metric ton
  • troy carat = carat troy
  • troy dr = dram troy
  • troy dram = dram troy
  • troy gr = grain troy
  • troy grain = grain troy
  • troy lb = pound troy
  • troy oz = oz troy
  • troy pennyweight = pennyweight troy
  • troy pound = pound troy
  • u = AMU
  • UK quintal (British quintal) = 100 pound
  • UK quintal2 (British quintal) = 112 pound
  • uncia (Roman uncia) = 420 grain
  • unciae = uncia
  • wey mass = 252 pound
• mass = kg (mass; category unit)
• mass basis bearing capacity = surface density (surface density)
• mass basis calorific value = specific energy (specific energy)
• mass basis enthalpy = specific energy (specific energy)
• mass basis flow rate = mass flow rate (mass flow rate)
• mass basis flow rate to area = flow rate area mass basis (flow rate area mass basis)
• mass basis flow rate to length = dynamic viscosity (dynamic viscosity)
• mass basis specific fuel consumption = specific fuel consumption mass basis (specific fuel consumption mass basis)
• mass basis specific heat capacity = specific heat capacity (specific heat capacity)
• mass basis throughput = mass flow rate (mass flow rate)
• mass concentration = mass density (mass density)
• Mass Density
  • concentration mass to volume = mass density
  • density = mass density
  • mass concentration = mass density
  • mass density = kg/m^3 (category unit)
  • mass to volume concentration = mass density
• mass density = kg/m^3 (mass density; category unit)
• Mass Flow Rate
  • damping viscosity = mass flow rate
  • flow rate mass basis = mass flow rate
  • mass basis flow rate = mass flow rate
  • mass basis throughput = mass flow rate
  • mass flow rate = kg/s (category unit)
  • throughput mass basis = mass flow rate
• mass flow rate = kg/s (mass flow rate; category unit)
• mass to area structural loading = surface density (surface density)
• Mass To Length
  • mass to length = kg/m (category unit)
• mass to length = kg/m (mass to length; category unit)
• mass to mass concentration = dimensionless unit
• mass to volume concentration = mass density (mass density)
• mass transfer coefficient = velocity (velocity)
• maxwell = 0.00000001 Wb (magnetic flux)
• mb = megabyte (data)
• me = electron mass (mass)
• mean calendar yr = calendar yr (time)
• mean solar day = day (time)
• mean solar yr = yr (time)
• measurement ton = freight ton (volume)
• mechanical power = power (power)
• mega = 1000000 (prefix)
• megabyte = 1024 kilobyte (data)
• meter = m (length)
• methuselah = 4 magnum (volume)
• metre = m (length)
• metric ton = 1000 kg (mass)
• Mexican libra = 1.015 pound (mass)
• mg (milligram) = milligram (mass)
• mgd (megagallons per day) = 1000000 gallon/day (volume flow rate)
• mho = siemens (conductance)
• mi = mile (length)
• micro = 0.000001 (prefix)
• micron = 0.000001 m (length)
• mil = 0.001 in (length)
• mile = 5280 foot (length)
• millenium = 1000 yr (time)
• millennial = millenium (time)
• milli = 0.001 (prefix)
• million = 1000000 (prefix)
• min = minute (time)
• mina (Greek mina) = 0.9463 pound (mass)
• miners inch = 1.5 ft^3/minute (volume flow rate)
• minim = 1.66666666666667E-02 dram fluid (volume)
• minute = 60 s (time)
• mite (English mite) = 0.05 grain (mass)
• mixing power = heat release rate (heat release rate)
• mmHg (millimeters of mercury) = mm*Hg weight density (pressure; derived unit)
• mn = neutron mass (mass)
• mo = month (time)
• mobility = electric mobility (electric mobility)
• modulus of admittance = conductance (conductance)
• modulus of impedance = electric resistance (electric resistance)
• mol (mole) = mol (amount of substance; base unit)
• molality (of a solute) = mol/kg (molality; category unit)
• Molality
  • molality (of a solute) = mol/kg (category unit)
• molar = universal gas (molar heat capacity)
• Molar Conductivity
  • molar conductivity = S/m^2*mol (category unit)
• molar conductivity = S/m^2*mol (molar conductivity; category unit)
• Molar Energy
  • caloric value mole basis = molar energy
  • chemical potential = molar energy
  • electrochemical potential = molar energy
  • enthalpy mole basis = molar energy
  • molar energy = J/mol (category unit)
  • mole basis caloric value = molar energy
  • mole basis enthalpy = molar energy
• molar energy = J/mol (molar energy; category unit)
• molar entropy = molar heat capacity (molar heat capacity)
• Molar Heat Capacity
  • gas = universal gas
  • molar = universal gas
  • molar entropy = molar heat capacity
  • molar heat capacity = J/mol*K (category unit)
  • mole basis specific heat capacity = molar heat capacity
  • specific heat capacity mole basis = molar heat capacity
  • universal gas (constant) = 8.31434 J/mol*K
• molar heat capacity = J/mol*K (molar heat capacity; category unit)
• Molar Mass
  • molar mass = kg/mol (category unit)
• molar mass = kg/mol (molar mass; category unit)
• molar refraction = molar volume (molar volume)
• Molar Volume
  • concentration volume to mole = molar volume
  • molar refraction = molar volume
  • molar volume = m^3/mol (category unit)
  • mole basis specific volume = molar volume
  • specific volume mole basis = molar volume
  • standard kilomole volume = 22.414 m^3/kmol
  • Vm = standard kilomole volume
  • volume to mole concentration = molar volume
• molar volume = m^3/mol (molar volume; category unit)
• mole = mol (amount of substance)
• mole basis caloric value = molar energy (molar energy)
• mole basis enthalpy = molar energy (molar energy)
• mole basis flow rate = mole flow rate (mole flow rate)
• mole basis specific heat capacity = molar heat capacity (molar heat capacity)
• mole basis specific volume = molar volume (molar volume)
• mole basis throughout = mole flow rate (mole flow rate)
• Mole Flow Rate
  • conversion change rate = mole flow rate
  • flow rate mole basis = mole flow rate
  • mole basis flow rate = mole flow rate
  • mole basis throughout = mole flow rate
  • mole flow rate = mol/s (category unit)
  • throughput mole basis = mole flow rate
• mole flow rate = mol/s (mole flow rate; category unit)
• mole to volume concentration = concentration (concentration)
• moment of force = energy (energy)
• Moment Of Inertia
  • moment of inertia = kg*m^2 (category unit)
  • moment of inertia of mass = moment of inertia
  • polar moment of inertia of mass = moment of inertia
  • product of inertia of mass = moment of inertia
• moment of inertia = kg*m^2 (moment of inertia; category unit)
• Moment Of Inertia Of Area
  • moment of inertia of area = m^4 (category unit)
  • moment of section = moment of inertia of area
  • polar moment of inertia of area = moment of inertia of area
  • product of inertia of area = moment of inertia of area
  • static moment of volume = moment of inertia of area
• moment of inertia of area = m^4 (moment of inertia of area; category unit)
• moment of inertia of mass = moment of inertia (moment of inertia)
• Moment Of Inertia Of Volume
  • moment of inertia of volume = m^5 (category unit)
  • polar moment of inertia of volume = moment of inertia of volume
  • product of inertia of volume = moment of inertia of volume
• moment of inertia of volume = m^5 (moment of inertia of volume; category unit)
• moment of section = moment of inertia of area (moment of inertia of area)
• Momentum
  • impulse = momentum
  • linear impulse = momentum
  • linear momentum = momentum
  • momentum = N*s (category unit)
• momentum = N*s (momentum; category unit)
• mono = 1 (prefix)
• month = 8.33333333333333E-02 yr*approx (time)
• monthly = month (time)
• mp = proton mass (mass)
• mpg (miles per gallon) = mile/gallon (fuel efficiency; derived unit)
• mph (miles per hour) = mile/hour (velocity; derived unit)
• mu (micro) = 0.000001 (prefix)
• mutual inductance = inductance (inductance)
• Mx = maxwell (magnetic flux)
• myria = 10000 (prefix)

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