• c (centi) = 0.01 (prefix)
• C = coulomb (electric charge)
• c = speed of light (velocity)
• cable = cable length (length)
• cable length = 720 ft (length)
• cal = calorie (energy)
• calendar yr (calendar year) = 365 day (time)
• caliber (gun barrel caliber) = 0.01 in (length)
• caloric value mole basis = molar energy (molar energy)
• calorie (International Table calorie) = 4.1868 J (energy)
• calorific value mass basis = specific energy (specific energy)
• calorific value volume basis = pressure (pressure)
• Canadian gallon = 0.00454609 m^3 (volume)
• candela = cd (luminous intensity)
• candle power (spherical) = 12.556 lumen (luminous flux)
• Capacitance
  • abF = abfarad
  • abfarad = 1000000000 F
  • capacitance = F (category unit)
  • electric capacitance = capacitance
  • F = farad
  • farad = s/ohm (derived unit)
  • sF = statfarad
  • statfarad = 1.11265E-12 F
• capacitance = F (capacitance; category unit)
• capacity = volume (volume)
• capture unit = wave number (wave number)
• carat = carat troy (mass)
• carat t = carat troy (mass)
• carat troy (troy carat) = 0.0002 kg (mass)
• case (of paper) = 4 bundle
• catty (Chinese catty) = 1.33333333333333 pound (mass)
• cc (cubic centimeters) = cm^3 (volume; derived unit)
• cd (candela) = cd (luminous intensity; base unit)
• celsius = dC (thermodynamic temperature)
• cen = century (time)
• cental (British cental) = 100 pound (mass)
• centennial = century (time)
• centesimal minute = 0.01 grade (plane angle)
• centesimal second = 0.0001 grade (plane angle)
• centi = 0.01 (prefix)
• centigrade = dC (thermodynamic temperature)
• centimilli = 0.00001 (prefix)
• century = 100 yr (time)
• Cesium frequency = Sc frequency (frequency)
• cfs (cubic feet per second) = ft^3/s (volume flow rate; derived unit)
• ch = chain (length)
• chain (surveyors chain) = 4 rod (length)
• char = byte (data)
• character = byte (data)
• charge = electric charge (electric charge)
• charge density = electric charge density (electric charge density)
• chemical potential = molar energy (molar energy)
• chetvert (Russian chetvert) = 5.96 bushel (volume)
• chin = catty (mass)
• cho (Japanese cho) = 2.45 acre (area)
• Ci = curie (activity)
• circle = 2 pi*rad (plane angle)
• circular frequency = angular velocity (angular velocity)
• circular inch = 0.25 pi*in^2 (area)
• circular mil = 0.00000025 pi*in^2 (area)
• city block (informal) = 100 yard*approx (length)
• cloth finger = 4.5 in (length)
• cloth quarter = 9 in (length)
• cm (centimilli) = 0.00001 (prefix)
• Compressibility
  • compressibility = 1/Pascal (category unit)
  • specific fuel consumption volume basis = compressibility
  • stretchability = compressibility
  • twistability = compressibility
  • volume basis specific fuel consumption = compressibility
• compressibility = 1/Pascal (compressibility; category unit)
• concentration (of amount of substance) = mol/m^3 (concentration; category unit)
• Concentration
  • concentration (of amount of substance) = mol/m^3 (category unit)
  • concentration mole to volume = concentration
  • ionic strength = concentration
  • mole to volume concentration = concentration
  • solubility = concentration
• concentration mass to mass = dimensionless unit
• concentration mass to volume = mass density (mass density)
• concentration mole to volume = concentration (concentration)
• Concentration Rate
  • concentration rate = mol/m^3*s (category unit)
  • reaction rate = concentration rate
• concentration rate = mol/m^3*s (concentration rate; category unit)
• concentration volume to mole = molar volume (molar volume)
• concentration volume to volume = dimensionless unit
• Conductance
  • abmho = 1000000000 mho
  • admittance = conductance
  • conductance = S (category unit)
  • mho = siemens
  • modulus of admittance = conductance
  • S = siemens
  • siemens = A/V (derived unit)
  • susceptance = conductance
• conductance = S (conductance; category unit)
• Conductivity
  • conductivity = S/m (category unit)
  • specific conductance = conductivity
  • volume conductivity = conductivity
• conductivity = S/m (conductivity; category unit)
• conversion change rate = mole flow rate (mole flow rate)
• cooling duty = dimensionless unit
• coomb = 4 bushel (volume)
• cord (of wood) = 128 ft^3 (volume)
• cord foot (of wood) = 16 ft^3 (volume)
• corrosion rate = velocity (velocity)
• cotton bale (US) = 500 pound (mass)
• cotton bale Egypt = 750 pound (mass)
• coul = coulomb (electric charge)
• coulomb = A*s (electric charge; derived unit)
• cps (characters per second) = byte/s (data flow rate; derived unit)
• crith = 0.0906 gram (mass)
• ct = carat troy (mass)
• cu = cup (volume)
• cubed = "^3"
• cubit = Biblical cubit (length)
• cup = 0.5 pint (volume)
• curie = 37000000000 Bq (activity)
• Currency
  • $ (US dollar) = $ (base unit)
  • buck = $
  • currency = $ (category unit)
  • dollar = $
  • tick = 0.03125 $
  • US dollar = $
• currency = $ (currency; category unit)
• current = electric current (electric current)
• Current Density
  • current density = A/m^2 (category unit)
  • electric current density = current density
• current density = A/m^2 (current density; category unit)
• curvature of a curve = wave number (wave number)
• cwt = short hundredweight (mass)

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