Color density object

A physical property is one that identifies an object. In addition to color, density, mass, and shape are physical properties. Carbon and chlorine are represented by their color. 

Degradation prodncts from macrolitter have different properties at sea, different effects and different futnies from the original products. Eventually, they form microparticles, usually made of plastic, which constitute a veiy important aspect of the problem of marine litter. They comprise an assembly of objects of varying size, shape, color, density and chemical composition [HID 12]. With densities ranging from 0.8 to 1.4 g cm", the plastics in the sea and on the surface are mainly polyethylene (density 0.92-0.97 g cm ), polypropylenes (0.85-0.94 g cm ) and polystyrenes (from less than 0.05 in the case of foamed polystyrene to 1.00 g cm ) [LES 11]. The denser plastics such as poly (vinyl chloride) (PVC) and polycarbonates, if they do not aggregate with the organic material, tend to sink. 

Limits on emissions are both subjective and objective. Subjective limits are based on the visual appearance or smell of an emission. Objective limits are based on physical or chemical measurement of the emission. The most common form of subjective limit is that which regulates the optical density of a stack plume, measured by comparison with a Ringelmann chart (Fig. 25-1). This form of chart has been in use for over 90 years and is widely accepted for grading the blackness of black or gray smoke emissions. Within the past four decades, it has been used as the basis for "equivalent opacity" regulations for grading the optical density of emissions of colors other than black or gray. 

Since it is a quantitative property, it is often more useful for identification than a qualitative property like color or smell. Moreover, density determines whether an object will float in a given liquid. If the object is less dense than the liquid, it will float if it is more dense, it will sink. It is also useful to discuss density here for practice with the factor-label method of solving problems, and as such, it is often emphasized on early quizzes and examinations. 

We developed systems where we could conveniently control the parameters affecting the assemblies and characterize them. These parameters include the shapes, surface properties, densities, and colors of the objects the directionality of the forces between objects and the densities and surface properties of the fluids. Some of these systems allow quick examination of tens to thousands of assembling particles. Agitation is normally in the form of fluid shear or gravity. The following sections describe some of the successes and failures in these experiments in self-assembly. 

Most of our experiments used large (millimeter-sized) polyhedral, polymeric objects that could be easily manipulated by hand. These objects were cast from molds, and the sides were readily differentiated into hydrophobic and hydrophilic sets. By working at a relatively large size scale, we were able to fabricate objects of a complexity difficult to achieve on a smaller, sub-millimeter scale. We could control the colors of the faces of the objects, the densities of the water phase (by adding a salt), and the densities of the objects (by adding a dense metal oxide powder). 

A quantity of colored water was poured into a 50 mL graduated cylinder, raising it to the level shown on the left in the figure. Next, an object with a mass of 25.2 g was placed in the water, raising the level to that shown on the right. What was the density of the object in g/mL ... 

A sample of vermilion-colored mineral was weighed in air, then weighed again while suspended in water. An object is buoyed up by the mass of the fluid displaced by the object. In air, the mineral weighed 18.49 g in water, it weighed 16.21 g. The densities of air and water are 1.205 g/L and 0.9982 g/cm, respectively. What is the density of the mineral ... 

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