Specific weights

As noted, the oxidation resistance of silicon nitride ceramics depends on the type and concentration of the sintering aids. In materials designed for high temperature appHcations the specific weight gain resulting from oxidation upon a 500-h air exposure at 1200°C and 1350°C is about 1—2 g/m and 2—4 g/m, respectively. The kinetics of the oxidation process have been iavestigated (63,64) as has the corrosion resistance (65). Corrosion resistance is also dependent on material formulation and density. 

Bismuth pellets range from 4.5 to 60 g in size and are used for metallurgical additives. Thek convenient size and specific weights make them particularly useful as feedstock when a given quantity of bismuth must be added regularly to a melt. 

W, = work input to the shaft Ql = volume of lubricant Pl = specific weight of the lubricant CpL = specific heat of the lubricant At = lubricant temperature rise... 

Rolling ball. A small steel ball with specific weight and diameter is rolled down an inclined plane onto a thin film of adhesive placed at the bottom. The distance the ball rolls on the adhesive film before stopping is a measure of the tack (the longer the distance, the lower the tack). 

The concentration of solids in the feed sludge is expressed by weight fraction c. It is also possible to evaluate experimentally the weight ratio of wet cake to its dry content m. Hence, a unit weight of sludge contains me of wet cake. We denote y as the specific weight of feed sludge. This quantity contains c amount of solids hence, the ratio of the mass of solids in the cake to the filtrate volume is ... 

Determine the amount of wet cake obtained from filtering 10 m of suspension with a relative specific weight of 1.12. The suspension is 20% by weight solids and the cake wetness is 25%. 

This expression can be used to compute the void fraction from experimentally determined values of the specific weights. 

Determine the settling velocity of spherical quartz particles in water (d = 0.9 mm) using the dimensionless plot of the Lyachshenko and Reynolds numbers versus the Archimedes number in the figure above. The Lyashenko number is the same as the dimensionless settling number. The specific weight of the quartz is 2650 kg/m and the temperature of the water is 20° C. 

Determine the maximum size of quartz particles settling in water (t = 20° C) that can be described by Stokes law. What is this particle s settling velocity The specific weight of quartz is 2650 kg/m ... 

Determine the maximum diameter of spherical chalk particles entrained by an upward-moving water stream with a velocity of 0.5 m/sec. The liquid temperature is t = 10° C, and the specific weight of the chalk is 2,710 kg/10° C. 

Estimate fireball diameter and duration. Liquid propane has a specific weight of 585.3 kg/m, so the total mass of propane in the tank is ... 

The ketone derivatives of the pseudo-ionone are converted under similar conditions into ketone-derivatives of the ionone. The pure ionone corresponds to the formula CjjHjjO, it boils under a pressure of 12 mm. at a temperature of about 128° 0., its specific weight is 0-935, and its index of refraction mD = 1-507. 

The preduct of condensation remaining in the distilling apparatus is purified by the fractional distillation in vacuo. Under a pressure of 12 mm. a liquid distils off at a temperature of from 143° to 145° C. This preduct of condensation of citral with acetone, which I term Pseudo-ionone, is a ketone readily decomposable by the action of alkalis. Its formula is CigHjoG, its index of refraction nT> = 1-527, and its specific weight 0-904. 

Gas constant (J/mol K) coarse particle radius Specific weight of feed Degree of mixing Time scale (s)... 

Titanium alloys are widely applied in aviation, rocket engineering and ship building due to their high strength, corrosion resistance and the small specific weight. 

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