German:
"Umrechnung[Bearbeiten] (Conversion, English)
1 Prozent = 10hoch-2 = 10.000 ppm = 1 Teil pro Hundert = 1 %
1 Promille = 10hoch-3 = 1.000 ppm = 1 Teil pro Tausend = 0,1 % = 1 ‰
1 bp (basis point/ permyriad ) = 10hoch-4 = 100 ppm = 1 Teil pro Zehntausend = 0,01 % = 1 0/000
1 pcm (per cent mille) =10hoch-5 =10 ppm = 1 Teil pro Hunderttausend = 0,001 %
1 ppm = 10hoch-6 = 1 Teil pro Million = 0,0001 % (parts per million)
1 ppb (parts per billion) = 10hoch-9 = 1 Teil pro Milliarde
1 ppt (parts per trillion) = 10hoch-12 = 1 Teil pro Billion
1 ppq (parts per quadrillion) = 10hoch-15 = 1 Teil pro Billiarde"
http://de.wikipedia.org/wiki/Parts_per_millionEnglish:
"Parts-per expressions[edit]
One part per hundred is generally represented by the percent (%) symbol and denotes one part per 100 parts, one part in 10², and a value of 1 × 10potence-2. This is equivalent to approximately one drop of water diluted into 5 milliliters (one spoonful), or about fifteen minutes out of one day.
One part per thousand should generally be spelled out in full and not as "ppt" (which is usually understood to represent "parts per trillion"). It may also be denoted by the permille (‰) symbol. Note however, that specific disciplines such as the analysis of ocean water salt concentration, as well as educational exercises, occasionally use the "ppt" abbreviation. "One part per thousand" denotes one part per 1000 parts, one part in 103, and a value of 1 × 10potence-3. This is equivalent to one drop of water diluted into 50 milliliters (ten spoon-fulls), or about one and a half minutes out of one day.
One part per ten thousand is denoted by the permyriad (0/000) symbol. In contrast, in finance, the basis point is a quantity with dimensions of (time potence-1) and is typically used to denote changes in or differences between percentage interest rates. For instance, a change in an interest rate from 5.15% per annum to 5.35% per annum could be denoted as a change of 20 basis points. Although rarely used in science (ppm is typically used instead), one permyriad has an unambiguous value of one part per 10,000 parts, one part in 10potence4, and a value of 1 × 10potence-4. This is equivalent to one drop of water diluted into half a liter, or about nine seconds out of one day.
One part per million (ppm) denotes one part per 1,000,000 parts, one part in 106, 1/1,000,000 * 100% = 0.0001% (or 1% = 10,000 ppm), and a value of 1 × 10potence-6. This is equivalent to one drop of water diluted into 50 liters (roughly the fuel tank capacity of a compact car) or about 32 seconds out of a year.
One part per billion (ppb) denotes one part per 1,000,000,000 parts, one part in 109, 1/1,000,000,000 * 100% = 0.0000001% (or 1% = 10,000,000 ppb) and a value of 1 × 10potence-9. This is equivalent to one drop of water diluted into 250 chemical drums (50 m³), or about three seconds out of a century.
One part per trillion (ppt) denotes one part per 1,000,000,000,000 parts, one part in 1012, and a value of 1 × 10potence-12. This is equivalent to one drop of water diluted into 20 Olympic-size swimming pools (50,000 m³), or about three seconds out of every hundred thousand years.
One part per quadrillion (ppq) denotes one part per 1,000,000,000,000,000 parts, one part in 1015, and a value of 1 × 10potence-15. This is equivalent to 1 drop of water diluted into a cube of water measuring approximately 368 meters on a side (fifty million cubic meters, which is a cube about as tall as the Empire State Building's 102 stories), or two and a half minutes out of the age of the Earth (4.5 billion years). Although relatively uncommon in analytic chemistry, measurements at the ppq level are sometimes performed.[4]"
http://en.wikipedia.org/wiki/Parts-per_notation
