Pound, the

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. 

As a fuel, municipal solid waste (MSW) does not compare too favorably with more traditional solid fuels, such as coal. M.SW averages somewhere around 4500 Btu/lb, versus coal at 10,500-13,000 Btu/lb. Flowever, given the current U.S. population of 250 million and the annual generation of waste per person of fifteen hundred pounds, the potential energy content in the annual waste generated in the U.S. alone is comparable to nearly seventy million tons of coal and has the potential to generate over 13,000 MW of electrical power. As of a published report in 1993, 128 facilities were actually in operation, with an additional... 

Phenol was the 33rd highest-volume chemical. The 1994 U.S. production of phenol was approximately 4 billion pounds. The current world capacity is approximately 15 billion pounds. Many chemicals and polymers derive from phenol. Approximately 50% of production goes to phenolic resins. Phenol and acetone produce bis-phenol A, an important monomer for epoxy resins and polycarbonates. It is produced by condensing acetone and phenol in the presence of HCI, or by using a cation exchange resin. Figure 10-8 shows the Chiyoda Corp. bisphenol A process. 

Another nonsynthetic source for cyclohexane is natural gasoline and petroleum naphtha. However, only a small amount is obtained from this source. The 1994 U.S. production of cyclohexane was approximately 2.1 billion pounds (the 45th highest chemical volume). 

This pressure of lOpsi acts on all parts of the fluid container, including the bottom of the output piston. The upward force on the output piston is 200pounds (lOpsi x piston area). In this case, the original force has been multiplied tenfold while using the same pressure in the fluid as before. In any system with these dimensions, the ratio of output force to input force is always 10 to 1, regardless of the applied force. For example, if the applied force of the input piston is 50 pounds, the pressure in the system will be 25 psi. This will support a resistant force of 500 pounds on the output piston. The system works the same in reverse. 

The force acting on the left side of the piston is equal to 20 psi X 6in or 120 pounds. The opposing force generated by the right side of the piston is 20 psi x 4in or 80 pounds. Therefore, there is a net unbalanced force of 40 pounds (120 — 80) acting the right, and the piston will move in that direction. 

Example The liquid that fills a certain container weighs 1496.6 pounds. The container is 4 feet long, 3 feet wide and 2 feet deep. Its volume is 24 cubic feet (4 ft x 3 ft x 2 ft). If 24 ft of this liquid weighs 1497.6 pounds, then 1 cubic foot weighs ... 

For the monoprotected a-amino aldehydes, the best results in yield and stereoselectivity were obtained under kinetic control conditions which gave the expected sw-com pounds. The addition of tin(lV) chloride did not result in increased syn selectivity, and the use of boron trifluoride diethyl ether complex did not provide the ann -isomer as the major product. 

Glycopyrrolate (Robinul) is prescribed for a patient as part of the preoperative preparation for surgery. The drug dose recommendation is 0.002 mg/ lb. The patient weighs 150 pounds. The nurse expects the primary care provider to prescribe... 

Using the pressure drop across the area producing spray in lbs/in2 and the lid contact surface in in2, calculate the weight in pounds. The pressure drop will be the pressure provided to the tee minus the vessel pressure. 

The average man in a certain class weighs 180 pounds. The average woman in that class weighs... 

The price of cheddar cheese is 2.12 per pound. The price of Monterey Jack cheese is 2.34 per pound. If Harrison buys 1.5 pounds of cheddar and 1 pound of Monterey Jack, how much will he spend in all ... 

The human body is approximately eighteen percent carbon by weight. That means 18 pounds of a hundred-pound person are carbon. If you weigh 100 pounds, the carbon, hydrogen, and oxygen that you contain total 93 pounds. Only seven of the total 100 pounds are made up of other elements. 

The British or Tong ton weighs 2240 pounds the American or short ton is 2000 pounds, and the metric ton (tonne) of 1000 kilograms is equivalent to 2205 pounds. 

Von Schnitzler pounded the table. This proposal was not "in consonance with either the legal position or with the political and economic facts of hfe. After all that has happened, the French standpoint must be considered an imputation and insult."... 

For this company, a typical chemical s cost is about 50 cents per pound. The firm generally assumes no more than a three-year marketing lifetime for its type of new chemicals. 

The effect is much the same at costs of 1 and 2 per pound. The cost increase becomes increasingly dramatic as the production level decreases. As Figure A shows, however, the PMN-cost impact begins to weigh most heavily on each pound of a substance at a level between 20,000 pounds per year and 60,000 pounds per year, depending on the cost of the product. At 25 cents per pound, costs begin to rise rapidly under 60,000 pounds of output, while at 2 per pound the most rapid cost increases occur under 20,000 pounds of production. 

Again, PMN costs begin to weigh heavily between 20,000 and 40,000 pounds of annual output. Under 20,000 or 25,000 pounds, the cost burden rises dramatically. 

For a 35-year-old female weighing 160 pounds, the serum creatinine concentration was found to be 1.1 mg/dL. What is her creatinine clearance ... 

Bayberry wax, also known as myrtle or laurel wax, is obtained from the berries of various species of Myrica. The commercial wax, prepared from the berries of Myrica cerifera, may be obtained from chemical supply houses for about 0.60 per pound. The relative proportions of myristin and palmitin in bayberry wax varies somewhat, but these two compounds constitute about 95 per cent of the wax. 

The potential market for insecticides is of the order of 30,000,000 to 40,000,000 pounds, the probable market possibly 10,000,000. The fungicide prospect is suggested as a quarter of that for insecticides. 

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