pitoisuusiin
Pitoisuusiin is the illative plural form of the Finnish noun pitoisuus, which means concentration. In Finnish grammar, illoitive plural forms are used to express direction toward multiple concentrations, so pitoisuuksiin translates roughly as “to the concentrations.” The correct standard spelling for this illative plural is pitoisuuksiin; pitoisuusiin is commonly seen as a misspelling or a nonstandard variant.
Usage in texts is routine rather than semantic. Pitoisuus refers to the amount of a substance in
Grammatical note: pitoisuus is the base noun, and the illative plural suffix -iin is attached to the
Related concepts include pitoisuus (concentration) and pitoisuusmittaus (concentration measurement). The term does not designate a separate