Volume irregularly shaped solid

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... 

Problem The volume of an irregularly shaped solid can be determined from the volume of water it displaces. A graduated cylinder contains 19.9 mL of water. When a small piece of galena, an ore of lead, is added, it sinks and the volume increases to 24.5 mL. What is the volume of the piece of galena in cm and in L ... 

In fact, the derived SI unit for volume is the cubic meter. It is easy to visualize a cubic meter imagine a large cube whose sides are each 1 m in length. The volume of an irregularly shaped solid can be determined using the water displacement method, a method used in the MiniLab in this section. 

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 measuring the amount of water it displaces. 

Irregularly shaped solids do not have regular dimensions and therefore cannot have their volumes calculated with a formula. Rather, we determine their volumes by water displacement (assuming that they do not dissolve in water). This means that the volume of water a solid displaces upon complete immersion is equal to the volume of the solid. In the laboratory, the process is as follows ... 

When submerged in a liquid, an irregularly shaped solid displaces a volume of liquid equal to its own volume. The necessary data can be obtained by two mass measurements of the type illustrated here the required calculations are like those in Example 1-3. 

How can you find the volume of a solid that has an irregular shape ... 

Volume Volume is the space occupied by an object. The derived unit for volume is the cubic meter, which is represented by a cube whose sides are all one meter in length. For measurements that you are likely to make, the more useful derived unit for volume is the cubic centimeter (cm ). The cubic centimeter works well for solid objects with regular dimensions, but not as well for liquids or for solids with irregular shapes. In the miniLAB on the next page, you will learn how to determine the volume of irregular solids. 

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. 

Another concept of critical interest in dealing with solid particles is that of shape. The weight or volume (or some other characteristic dimension) of particles of irregular shape may sometimes be expressed in terms of equivalent spherical particles. This procedure is useful, because it simplifies calculations, but it tends to lead the novice to believe that particles are more often spherical than not. Of course, this is not the case. 

To what extent helium is adsorbed has been of major concern in adsorption studies for both volumetric and gravimetric methods. Until recently, the experimental error was often attributed to the finite adsorption of helium at high pressures, and different remedial methods were suggested [38-40]. The effect of helium adsorption on the gravimetric technique is clearly shown in Eq. (8). The volume difference, AF, will be overestimated if the adsorption of heUum is not negligible. Its effect on the volumetric technique ean be explained in terms of Fig. 1. The volume of the solid phase of adsorbent, F, is experimentally determined by heUum. This volume is sometimes called dead space or hehum volume of the adsorption cell, which is, indeed, the volume of adsorbent inaccessible to the hehum molecules. However, this value is usually taken for the volume of adsorbent inaccessible to the adsorbate molecules. The difference in molecular dynamic size and shape between helium and adsorbate is logically a source of error. The irregular solid surface and/or the complex strueture of micropores inevitably render uncertainty in the determination of P. As a eonsequenee of helium adsorption, the dead volume is underestimated. 

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