Percent by Weight

Expressing concentrations as percent by weight is common with aqueous solutions. Using percent by volume is common with mixes of gases. 

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Solubility is given in parts by weight (of the formula weight) per 100 parts by weight of the solvent (i.e., percent by weight) and at room temperature. Another unit frequently used is grams per 100 mF of solvent (mF per 100 mF for liquids and gases). The symbols of the common mineral acids represent aqueous solutions of these acids. 

If we represent the percent by weight of an element in monomer i as (% and the molecular weight of the monomer (repeat unit) by Mq j, then the mass of that element in a sample is... 

Information furnished by consumers percent by weight retained. 

Balling. Balling is a measure of the sugar concentration in a grain mash, expressed in degrees. It approximates percent by weight of the sugar in solution. 

Ds = particle diameter (such that 85 percent by weight of particles are smaller than Ds = the slurry mixture density [L = hquid viscosity... 

Fine particulate slurries in concentrations up to 70 percent by weight are possible with standard channel spacings. Wide-gap units are used with larger particle sizes. Typical particle size should not exceed 75 percent of the single plate (not total channel) gap. 

Amounts finer tlian each laboratoiy sieve (square openings), percent by weight... 

Majac jet-piilverizer performance on natural graphite is given in Table 20-27. Graphite for pencils has 47, 83, 91, and 94 percent by weight smaher than 4, 9, 18, and 31 [Lm respectively. 

The sulfur content of U.S. coals varies widely, ranging from a low of 0.2 percent to as much as 7 percent by weight, on a diy Basis. The estimated remaining U.S. coal reserves of all ranks, by sulfur content, are shown in Fig. 27-1. Extensive data on sulfur and sulfur reduc tion potential, including washability, in U.S. coals are given in Sulfur and Ash Reduction Potential and Selected Chemical and Physical Properties of United States Coal (U.S. Dept, of Energy, DOE/PETC, TR-90/7, 1990 TR-91/1 andTR-91/2, 1991). 

The composition of coal ash varies widely. Calculated as oxides, the composition (percent by weight) varies as follows ... 

No. 6 fuel oil contains from 10 to 500 ppm vanadium and nickel in complex organic molecules, principally porphyrins. These cannot be removed economically, except incidentally during severe hydrodesulfurization (Amero, Silver, and Yanik, Hydrode.suljurized Residual Oils as Gas Turbine Fuels, ASME Pap. 75-WA/GT-8). Salt, sand, rust, and dirt may also be present, giving No. 6 a typical ash content of 0.01 to 0.5 percent by weight. 

The effectiveness of a given inhibitor generally increases with an increase in concentration, but inhibitors considered practical and economicaUy attractive are used in quantities of less than O.I percent by weight. 

For NO control only, steam is injected into the combustor directly to help reduce the primary zone temperature in the combustor. The amount of steam injected is in a ratio of 1 1 with the fuel. In this cycle, the steam is injected upstream of the combustor and can be as much as 5-8 percent by weight of the air flow. This cycle leads to an increase in output work and a shght increase in over l efficiency. Corrosion problems due to steam injection have been for the most part over-... 

Mixture Name or Other Identifier Percent by Weight Information Source Total Weight (in lbs) Amount of the Listed Chemical by Activity (in lbs.) ... 

For example, if a mixture contains a chemical (i.e., 12 percent zinc oxide) that is a member of a reportable chemical category (i.e., zinc compounds), the notification must include that the mixture contains a zinc compound at 12 percent by weight. Supplying only the weight percent of the parent metal (zinc) does not fulfill the requirement. The customer must be told the weight percent of the entire compound within a listed chemical category present in the mixture. 

Specific percentage by weight of a toxic chemical In the mixture or trade name product to be a trade secret, your notice to customers must contain a statement that the chemical Is present at a concentration that does not exceed a specified upper bound. For example, if a mixture contains 12 percent toluene and you consider the percentage a trade secret, the notification may state that the mixture contains toluene at no more than 15 percent by weight. The upper bound value chosen must be no larger than necessary to adequately protect the trade secret. 

Specific Gravity of Solids Barite, Percent by Weight Clay, Percent by Weight... 

Step I. To determine the percent by weight of calcium or of sodium chloride in the internal phase, locate the intersection of the line drawn horizontally from the cm of strong silver nitrate required to titrate 1 cm of whole mud with the line projected vertically from the volume percent of fresh water by retort. 

Vulcanization (Section 14.6) A technique for cross-linking and hardening a diene polymer by heating with a few percent by weight of sulfur. 

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