Density irregularly shaped solids

The density of an irregularly shaped solid is usually determined by measuring the mass and then measuring the volume of liquid that it displaces. The volume of liquid in a graduated cylinder is measured before the object is submerged and then measured again with the object submerged. The difference in the volume equals the volume of the object. 

D By placing an irregularly shaped solid into a graduated cylinder with a known volume of water, the water is displaced by a certain volume. If the density of the solid is known, then the mass of the object can be calculated. If the mass of the solid is known, then the density of the object can be calculated. 

To illustrate this method, we will consider the determination of the density of an irregularly shaped solid. In this determination we make three measurements. First, we measure the mass of the object on a balance. Next, we must obtain the volume of the solid. The easiest method for doing this is to partially fill a graduated cylinder with a liquid and record the volume. Then we add the solid and record the volume again. The difference in the measured... 

What is the density of an unknown and irregularly shaped solid To calculate the density of an object, you need to know its mass and volume. 

The volume of an irregularly shaped solid can be determined by immersing the solid in a liquid and measuring the volume of liquid displaced. Find the volume and density of the following ... 

Given the following data for an irregularly shaped solid, what is the object s density ... 

EXAMPLE 1-3 Determining the Density of an Irregularly Shaped Solid... 

WEB A solid with an irregular shape and a mass of 11.33 g is added to a graduated cylinder filled with water (d = 1.00 g/mL) to the 35.0-mL mark. After the solid sinks to the bottom, the water level is read to be at the 42.3-mL mark. What is the density of the solid ... 

In-situ density may also be determined from irregularly shaped field samples, by measuring the total volume by water displacement, then determining the specific gravity and volume of solids by standard test methods. To use this process, the grout in the soil voids must be eliminated. For the acrylics this is readily done by heating to the point where the gel vaporizes. 

Equation (29) would appear to tell us what is required for efficient clarification. The most important term, because of its exponent, is the particle diameter. This is why it is so important to allow particles to grow during precipitation. The density of the solid particle should also be maximized. There is a fundamental limit at the true solids density, but it is possible to approach this if the process forms particles free of voids and with compact structure. Also important, although not shown in- an equation developed for spherical particles, is the question of shape. Irregular particles will develop more frictional resistance and be more likely to be carried out of the clarifier by the rising flow of brine. 

Sion. Low bulk density materials (Pb < 0.2 g/cc) tend to cause solids conveying problems, either in the feed hopper or in the feed section of the extruder. Materials with irregularly shaped particles tend to have a low bulk density examples are fiber scrap or film scrap (flakes). When the bulk density is low, the mass flow rate will be low as well. Thus, the solids conveying rate may be insufficient to supply the downstream zones (plasticating and melt conveying) with enough material. Special devices and special extruders have been designed to deal with these low bulk density materials. A crammer feeder, as shown in Fig. 6.1, is a device used to improve the solids transport from the feed hopper into the extruder barrel. 

The characterization of solid particles, most of which are, in practice, irregular in shape, is usually made by analysing the particle size (the measure of size most relevant to the particle property which is under investigation) and its distribution. Other characteristic properties of the solid material may be included in the measure of size determined, for example Stokes diameter combines size, density and shape all in one parameter, they can be characterized separately if necessary. British Standard BS2955 attempts to define shape qualitatively a quantitative measure of particle shape can be obtained indirectly by analysing two or more measures of particle size and looking at different shape coefficients that relate to those sizes. 

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