Ounces

Some molybdenum contain from 0.002% to 0.2% rhenium. More than 150,000 troy ounces of rhenium are now being produced yearly in the United States. The total estimated Free World reserve of rhenium metal is 3500 tons. Rhenium metal is prepared by reducing ammonium perrhentate with hydrogen at elevated temperatures. 

Gram per square meter ounce per square foot 0.327 706... 

Ounce (avoirdupois) per cubic kilogram per cubic meter 1.001 154... 

The Eelative Contribution of Eeadfrom A.nthropogenic S ounces to the Total Human Eead Exposure in the Ended States EPA-600/D-86/184, U.S. Environmental Protection Agency, Washington, D.C., Aug. 1986 (NTIS PB86-241015). 

The concentration of most metals in the earth s cmst is very low, and even for abundant elements such as aluminum and iron, extraction from common rock is not economically feasible. An ore is a metallic deposit from which the metal can be economically extracted. The amount of valuable metal in the ore is the tenor, or ore grade, usually given as the wt % of metal or oxide. Eor precious metals, the tenor is given in grams per metric ton or troy ounces per avoirdupois short ton (2000 pounds). The tenor and the type of metallic compounds are the main characteristics of an ore. The economic feasibihty of ore processing, however, depends also on the nature, location, and size of the deposit the availabihty and cost of a suitable extraction process and the market price of the metal. 

To convert metric tons to millions of troy ounces, divide by 31.1. ForaiedyUSSR... 

For tank work, inches water column (in. wc) or ounces per square inch (osi) are commonly used to express the value of pressure or vacuum in the vapor space of a tank. These pressures are usually very low relative to atmospheric pressure. The common measures of pressure are compared as follows ... 

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