Pulmonary arterial hypertension is a rare but severe disease with an estimated five-year survival rate of only 57% after diagnosis, according to the Registry to Evaluate Early And Long-term PAH disease management (REVEAL), which registers data from patients in the United States.
Concentration of elements in the ocean relative to the total concentration in the bulk silicate Earth (BSE). Of all the elements, only Cl and Br have a significant fraction in the ocean (see inset), indicating the extreme hydrophilic character for the heavier halogens.
What chlorine is. 1  Chlorine is an element used in industry and found in some household products. 2  Chlorine is sometimes in the form of a poisonous gas. 3  Chlorine gas can be recognized by its pungent, irritating odor, which is like the odor of bleach.  Chlorine gas appears to be yellow-green in color.