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Okej, men där fanns även detta stycke

One part per thousand is generally 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 and 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 × 10–3. 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.

P.S. Inser att jag själv använt ppt på fel sätt och ska hädanefter hålla mig till promille eller PSU.

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