Where does “lukumääräpitoisuus” come from?

lukumääräpitoisuus (Finnish) comes from Finnish lukumäärä, from Finnish määrä, from Old East Slavic мѣра, from Proto-Slavic měra, from Proto-Balto-Slavic mḗˀrāˀ, from Proto-Indo-European meh₁-reh₂, from Proto-Indo-European meh₁- — to measure.

lukumääräpitoisuus (Finnish): number concentration number of particles per unit of volume

Definitions

number concentration number of particles per unit of volume

Ancestry of “lukumääräpitoisuus”, step by step

lukumääräpitoisuus traces back through two separate lines of ancestry.

via Finnish lukumäärä

Step	Language	Word	Meaning
1	Finnish	lukumäärä	number, count; amount
2	Finnish	määrä	amount, quantity; count, number; aim, target,...
3	Old East Slavic	мѣра	—
4	Proto-Slavic	měra	measure
5	Proto-Balto-Slavic	mḗˀrāˀ	—
6	Proto-Indo-European	meh₁-reh₂	—
7	Proto-Indo-European	meh₁-	to measure

via Finnish pitoisuus

Step	Language	Word	Meaning
1	Finnish	pitoisuus	percentage; concentration
2	Finnish	-uus	Forms nouns from adjectives, expressing a quality
3	Proto-Finnic	-uc	-ness, -hood

Every word from Proto-Indo-European meh₁- →Every word from Proto-Indo-European meh₁-reh₂ →Every word from Proto-Balto-Slavic mḗˀrāˀ →