Assertion: compound's part | /r/HasProperty | ppm
Facets:
Source sentences:
text: Mercury is an extremely rare element in Earth's crust, having an average crustal abundance by mass of only 0.08 parts per million (ppm).
text: Ore grades as little as 0.5 parts per million (ppm) can be economical.
text: This may explain why most plants contain about 1 part per million (ppm) of titanium, food plants have about 2 ppm, and horsetail and nettle contain up to 80 ppm.
text: Beryllium has a concentration of 2 to 6 parts per million (ppm) in the Earth's crust.