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what is dappled yarn
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Polyvinyl Chloride (PVC) is a versatile thermoplastic known for its wide range of applications from construction materials to medical devices. Its ability to crystallize is limited due to the bulky chlorine atoms attached to the carbon backbone, which hinder the close packing necessary for crystallization. While pure PVC is amorphous and doesn't crystallize well under normal conditions, adding certain types of heat stabilizers or undergoing specific processing conditions like controlled cooling can induce a degree of crystallinity. This crystalline structure can enhance certain mechanical properties such as stiffness and thermal resistance, though at the expense of clarity and flexibility. However, the extent of crystallinity achievable in PVC is generally lower compared to other thermoplastics due to its inherent molecular structure.
Boron carbide is a ceramic material, specifically a type of non-metallic, inorganic solid. It is renowned for its exceptional hardness, coming in just behind diamond and cubic boron nitride in terms of hardness scale. Structurally, it's made up of boron and carbon atoms, which forms a very rigid crystalline lattice. This makes it highly resistant to abrasion and thus, it's often used in applications requiring wear resistance, such as in abrasive nozzles, body armor, and cutting tools. Unlike metals, which have free electrons that facilitate electrical conductivity, or polymers, which are composed of long chains of organic molecules, ceramics like boron carbide are characterized by strong ionic and covalent bonds which contribute to their high hardness, high melting point, and generally poor conductivity.
The description of "a pigmented line that is broken at regular intervals" most likely refers to a common graphical representation or design element found in various fields such as art, cartography, and technical drawing. In the context of cartography, such a line might represent a specific type of boundary, path, or feature on a map. For example, dashed lines are often used to indicate intermittent features like seasonal rivers or administrative boundaries that are not clearly defined. In technical drawing, these lines can denote hidden edges or non-visible aspects of an object from a particular viewpoint. In art, such lines can be used to create visual texture or to suggest movement or discontinuity. The use of a pigmented line that is broken at regular intervals is a deliberate stylistic choice that can convey different meanings depending on the context. It is important to consider the medium in which this line appears to fully understand its significance.
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