Directors Desk - Measures and Units

European Measures and SI Units

(values are rounded)

Linear Measures
Millimeter
1 mm = 0.039 inch
 
Centimeter
1 cm = 0.394 inch
  
Decimeter
1 dm = 3.937 inch
 
Meter
1 m  = 1.0936 yard
     = 3.281 feet
     = 39.371 inch
 
Kilometer
1 km = 1000 meters
     = 1093.637 yards
     = 3280.869 feet
     = 0.621 british mile
Surface Measures
Square meters
1 qm = 1.196 square yard
     = 10.764 square feet
     = 1550 square inches
  
Are
1 a  = 100 square meters
     = 119.599 square yards
     = 1076.410 square feet
 
Hectare
1 ha = 100 ares
     = 10 000 square meters
     = 2.471 acres
     = 11960 square yards
     = 107641 square feet
 
Square kilometer
1 qkm = 100 hectares
      = 1 000 000 square meters
      = 247 acres
      = 0.386 square mile
Directors Desk

Cubic Measures
Cubic centimeter (1 cm3)
1 ccm = 1000 cubic millimeters
      = 0.061 cubic inches
 
Cubic decimeter (1 dm3)
1 cdm = 1000 cubic centimeters
      = 61.025 cubic inches
 
Cubic meter (1 m3)
1 cbm = 1000 cubic decimeters
      = 1.308 cubic yard 
      = 35.316 cubic feet
 
Register ton
1 RT = 2.832 cbm
     = 100 cubic feet
Measures of Capacity
Liter
1 l = 10 deciliters
    = 0.264 gallons (US)
    = 1.057 quarts (US)
    = 2.113 pints (US)
    = 8.453 gills (US)
 
    = 0.220 gallons (UK)
    = 0.880 quarts (UK)
    = 1.761 pints (UK)
    = 7.043 gills (UK)
 
Hectoliter
1 hl = 100 liters
     = 2.84 bushels (US)
     = 26.418 gallons (US)
 
     = 2.751 bushels (UK)
     = 22 gallons (UK)
Directors Desk

Weights
Milligram
1 mg = 0.001 grams
     = 0.0154 grains (troy)
1 g  = 0.001 kilograms
     = 15.4325 grains (troy)
 
Kilogram
1 kg = 1000 grams
     = 2.205 pounds (avoirdupois)
     = 2.679 pounds (troy)
 
Ton
1 t = 1000 kilograms
    = 1.102 tons (US)
    = 0.984 tons (UK)
Temperatures
Celsius     Fahrenheit     Kelvin
   0           32             273.15
  10           50             283
  20           68             293
  30           86             303
  40           104            313
 100           212            373
 
 -10           14             263
 -20           -4             253
 

Converting Celsius to Fahrenheit:
x is the temperature to be converted
( x Celsius * 9/5) + 32 = Fahrenheit
 
Converting Fahrenheit to Celsius:
y is the temperature to be converted
( y Fahrenheit - 32) * 5/9 = Celsius



SI Units Prefixes
1024 = Yotta = Y =
1.000.000.000.000.000.000.000.000

1021 = Zetta = Z =
1.000.000.000.000.000.000.000

1018 = Exa = E =
1.000.000.000.000.000.000

1015 = Peta = P =
1.000.000.000.000.000

1012 = Tera = T =
1.000.000.000.000

109 = Giga = G =
1.000.000.000

106 = Mega = M =
1.000.000

103 = Kilo = k =
1.000

102 = Hecto = h =
100

101 = Deka = da =
10

10-1 = Deci = d =
0.1

10-2 = Centi = c =
0.01

10-3 = Milli = m =
0.001

10-6 = Micro = µ =
0.000.001

10-9 = Nano = n =
0.000.000.001

10-12 = Pico = p =
0.000.000.000.001

10-15 = Femto = f = 
0.000.000.000.000.001

10-18 = Atto = a =
0.000.000.000.000.000.001

10-21 = Zepto = z =
0.000.000.000.000.000.000.001

10-24 = Yocto = y =
0.000.000.000.000.000.000.000.001



SI Units
Time is measured in Seconds.
 1 second is the time of 9.192.631.770 periods 
 of the radiation of the Cesium 133 atom 
 corresponding to the transition between 
 the two hyperfine levels in ground state.

Length is measured in Meter.
 1 meter is the path of light during 
 1/299.792.458 of a second.

Mass is measured in Kilogram.
 There is a prototype in my garage but you 
 may want to refer to the one in Paris. 
 Approximation:
 1 dm3 H2O at 4o Celsius ~ 1 kg

Electric current is measured in Ampere.
 1 ampere is the current necessary in 
 two parallel conductors of near zero 
 diameter running infinitely through vaccum 
 to apply a force of 2 x 10-7 newton per meter 
 on each other.

Temperature is measured in Kelvin.
 1 kelvin is 1/273.16 of the temperature 
 where water can exist simultaneously
 as ice, water and vapour.

Amount of a substance is measured in Mole.
 1 mole contains the number of particles 
 that is equal the number of atoms in 
 0.012 kilograms of Carbon 12.

Luminous intensity is measured in Candela.
 1 candela is emitted by a source with a 
 monochromatic radiation of 540 hertz and a
 radiant intensity of 1/683 watt per steradian. 



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