part per million
71DGH — Degrees of General Hardness (dGH) is a unit of water hardness, specifically of General Hardness.General Hardness is a measure for the number of calcium and magnesium cations per volume of water. 1 dGH corresponds to 10 mg of calcium oxide or… …
72Safari Club International — Infobox Organization name = Safari Club International image border = Scilogo.jpg caption = membership = 50,000 headquarters = Tucson, Arizona formation = 1973 website = http://www.safariclub.org/ Safari Club International is an international… …
73chemistry — /kem euh stree/, n., pl. chemistries. 1. the science that deals with the composition and properties of substances and various elementary forms of matter. Cf. element (def. 2). 2. chemical properties, reactions, phenomena, etc.: the chemistry of… …
74undersea exploration — Introduction the investigation and description of the ocean waters and the seafloor and of the Earth beneath. Primary objectives and accomplishments Included in the scope of undersea exploration are the physical and chemical… …
75Cuyahoga River — watershed with its upstream branches Origin …
76Partie par billion — Une partie par billion (abrégé en ppt, pour part per trillion) est un terme fréquemment utilisé par les scientifiques (toxicologie, chimie, métallurgie, etc.) malgré une rigueur discutable. Il faut savoir que le terme billion en anglais est… …
77respiratory disease — ▪ human disease Introduction any of the diseases and disorders that affect human respiration (respiration, human). Diseases of the respiratory system may affect any of the structures and organs that have to do with breathing, including the… …
78Seismometer — Seismometers (from Greek Seism the shakes and Metro I measure ) are instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Records of… …
79Mercury poisoning — The metallic element mercury is poisonous to humans. Mercury poisoning can occur in both acute and chronic forms. Acute mercury poisoning (which today is less common) is associated with ulcerations of the stomach and intestine and with toxic… …
80Poisoning, mercury — The metallic element mercury is poisonous to humans. Mercury poisoning can occur in both acute and chronic forms. Acute mercury poisoning (which today is less common) is associated with ulcerations of the stomach and intestine and with toxic… …
