Gravity number

Fig. 4. Terminal velocities in air of spherical particles of different densities settling at 21°C under the action of gravity. Numbers on curves represent tme (not bulk or apparent) specific gravity of particles relative to water at 4°C. Stokes-Cunningham correction factor is included for settling of fine particles.

The third group of terms on the right-hand side describes particle transport to the collector by gravity forces acting on the suspended particle. Hydrodynamic retardation is included. Here, Nc is a gravity number, that is, the ratio of the Stokes settling velocity of a suspended particle to the superficial or approach velocity of flow. 

There are three dimensionless parameters in addition to e. These are a parameter that Oron el al have called the gravity number, ... 

Cetane number Diesel Index Blending octane number (Motor method) Character- ization Factor Boiling- point gravity number ... 

For crude oils, the American Petroleum Institute (API) oil gravity number is a widely used classification it is defined as ... 

It is based on the observations that the specific gravities of hydrocarbons are related to their H/C ratios (and thus to their chemical character) and that their boiling points are linked to the number of carbon atoms in their molecules. 

The different cuts obtained are collected their initial and final distillation temperatures are recorded along with their weights and specific gravities. Other physical characteristics are measured for the light fractions octane number, vapor pressure, molecular weight, PONA, weight per cent sulfur, etc., and, for the heavy fractions, the aniline point, specific gravity, viscosity, sulfur content, and asphaltene content, etc. 

Ammoniameter. This hydrometer, employed in finding the density of aqueous ammonia solutions, has a scale graduated in equal divisions from 0° to 40°. To convert the reading to specific gravity multiply by 3 and subtract the resulting number from 1000. 

Twaddell Hydrometer. This hydrometer, which is used only for liquids heavier than water, has a scale such that when the reading is multiplied by 5 and added to 1000 the resulting number is the specific gravity with reference to water as 1000. To convert specific gravity at 60°/60°F to Twaddell degrees, take the decimal portion of the specific gravity value and multiply it by 200 thus a specific gravity of 1.032 = 0.032 X 200 = 6.4° Tw. See also special table for conversion to density and Baume scale. 

Numerous methods for the deterrnination of monomer purity, including procedures for the deterrnination of saponification equivalent and bromine number, specific gravity, refractive index, and color, are available from manufacturers (68—70). Concentrations of minor components are deterrnined by iodimetry or colorimetry for HQ or MEHQ, by the Kad-Eisher method for water, and by turbidity measurements for trace amounts of polymer. 

Number hardness adsorption. refractive gravity process... 

Common name CAS Registry Number Molecular formula Bromine, % Specific gravity Mp, °C C Sources... 

Metal cation CAS Registry Number Formula % Metal Specific gravity, g/cm 1992 price, /kg... 

Component CAS Registry Number Mol wt Mp, °C Bp, Refractive index, Specific gravity, d Surface tension, 20°C mN/m (=dyn/cm) Flash point, °... 

Component CAS Registry Mol Mp, °C Number wt Bp, °C/kPa Refractive iadex, Specific gravity, 4 Flash poiat, °C... 

Compound CAS Registry Number Formula Mol wt Boiling point, Iv Critical pressure, kPa Critical temperature, K Specific gravity, hquid Gross heating value, Ml/m ... 

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