Assertion: ocean's part | /r/HasProperty | ppm
Facets:
Source sentences:
text: Prior to industrialization, the concentration of carbon dioxide in the atmosphere was 280 parts per million (ppm).
text: (Trace elements occur at concentrations of less than 1 part per million (ppm), or 1 milligram per kilogram of water.)
text: Bromine, accumulated after being leached from the land, is economically recovered from the Dead Sea, where it occurs at 55,000 parts per million (ppm).