CONVERSION TABLE

 

Systeme Intenationale d’Unités

 

a          = are = 102 square metres = 1076.39 square feet

d          = day = 86 400 seconds

°C        = degree Celsius (to obtain temperature in degrees Farheneit, multiply by  1.8 and     then add 32)

Ci         = Curie = 37 x 109 disintegrations per second = 2.22 x 1012 disintegrations per minute   (dpm)

g          = gram = 10-3 kilogram = 2.204 62 x 10-3 pound

g/kt      = gram per kilotonne = 0.002 pound per 103 US (short) tons

g/m3     = gram per cubic metre = 8.345 40 x 10-6 pound per US gallon = 10.0224 x 10-6 pound per British gallon

h          = hour = 3600 seconds

h-         = hecto = 102 x

ha         = hectare = 104 suqre metres = 10-2 square kilometre = 2.741 05 acres

J           = joule = 0.238 846 calorie

J/kg      = joule per kilogram = 0.108 339 calorie per pound

k          = kilo = 103 x

kCi       = kilocurie = 37 x 1012 disintegrations per second

kCi/kg  = kilocurie per kilogram = 453.5924 curies per pound

kCi/kt   = kilocurie per kilotonne = 907.1847 curies per 103 US (short) tons

kCi/mt  = kilocurie per magatonne = 907.1847 curies per 106 US (short) tons

kg        = kilogram = 2.204 62 pounds

kg/ha    = kilogram per hectare = 0.892 179 pounds per acre

kg/kt    = kilogram per kilotonne = 2 pounds per 103 US (short) tons

kg/m3    = kilogram per cubic metre = 8.345 40 x 10-3 pound per US gallon = 10.022 4 x 10-3 pound per British gallon = 1.685 55 pounds per cubic yard

kJ         = kilojoule = 103 joules = 238.846 calories

k/Jm2    = kilojoule per square metre = 238.846 calories per square metre = 0.154 094 calorie per square inch

km       = kilometre = 103 metres = 0.621 371 mile

kPa      = kilopascal = 9.689 23 x 10-3

kR        = kiloröntgen = 103 röntgens, which see

kt         = kilotonne = 106 kilograms = 1102.31 US (shrt) tons = 984.207 British (log) tons. 1

m         = metre = 3.280 84 feet

m-        = milli =10-3x

m2        = square metre = 10.763 9 square feet = 1550.00 square inches

m3        = cubic metre = 103 litres = 264.172 US gallons = 219.969 British gallons = 1.307 95 cubic yards

m3/ha    = cubic metre per hectare = 55.846 6 board feet per acre

mg        = milligram = 10-6 kilogram = 2.204 62 x 10-6 pound

mg/m3   = milligram per cubic metre = 8.345 40 x 10-9 pound per US gallon = 10.0224  x 10-9 pound per British gallon

min       = minute = 60 seconds

mol       = mole = that amount of substance which contains as many elementary entities as there are atoms in 12 grams of 12C, that is, 602.252 x 1021 elementary entities

mm       = millimetre = 10-3 metre = 0.039 370 1 inch

mmol    = millimole = 10-3 mole, which see

m/s       = metre per second = 3.6 kilometres per hour = 2.236 94 miles per hour

M         = mega- = 106 x

MCi     = megacurie = 37 x 1015 disintegrations per second

MCi/kg = megacurie per kilogram = 453.592 4 kilocuries per pound

MCi/kt =  megacurie per kilotonne = 907.184 7 kilocuries per 103 US (short) tons

MCi/Mt = megacurie per megatonne = 907.184 7 kilocuries per 106 US (short) tons

Ms       = megasecond = 106 seconds = 11.574 1 days

Mt        = megatonne = 109 kilograms = 1.102 31 x 106 US (short) tons = 0.984 207 x 106 British (long) ton. 1

μ          = micro- 0 10-6 x

μg        = microgram = 10-9 kilogram = 2.204 62 x 10-12 pound

μg/kg   = microgram per kilogram = part per 109 parts, by weight

μg/m3   = microgram per cubic metre = 1.685 55 x 10-12 pound per cubic yard

n-         = nano = 10-9 x

nm        = nanometre = 10-9 metre = 39.370 1 x 10-9 inch = 10 Āngströms

Pa        = pascal =  9,869 23 x 10-6 atmosphere = 145.038 x 10-6 pound per square inch

R          = röntgen = a unit of X or gamma radiation exposure producing a charge of 258 x 10-6 coulomb per kilogram of air; for biota it is numerically equivalent to ca. 1 ‘rad’, a unit of ionizing radiation absorption of 10-2 joule per kilogram of body weight (Arena, 1971 : 215-218)

s           = second

t           = tonne = 103 kilograms = 1.102 31 US (short) tons = 0.984 207 British (long) ton

 

1  - The term ‘kiloton’ as used by the US Department of Defense and other US agencies is the equivalent of 0.907 x 106 kg of TNT (4.187 x 1012 J) and its ‘megaton’ of 0.907 x 109 kg of TNT (4.187 x 10-15 J).