Engineering Materials Week 10 14.4 (a) Compute the repeat molecular weight of polypropylene. (b) Compute the number average molecular weight for a polypropylene for which the degree of polymerization is 15‚000. 14.10 Using the definitions for total chain molecule length L and average chain end-to-end distance r‚ for a linear polytetrafluroethylene determine: (a) the number average molecular weight for L=2000 nm. (b) the number–average molecular weight for r=15 nm. 14.19 (a) Determine the
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others tight‚ some have an ankle collar‚ while others do not‚ but one of the most apparent features that makes a boot special is the material that it is comprised of. There are two prominent materials that soccer cleats are made of‚ man-made synthetic material‚ and kangaroo leather. Synthetic material has been dominating the market currently‚ it is a lightweight material‚ water resistant‚ and usually contains the latest technologies. Kangaroo leather is unique from other leathers like calfskin because
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Paper as food packaging material Paper is a quite versatile material‚ utilized in flexible‚ semi-rigid‚ and rigid packaging. It is made into a wide variety of single- and multi-wall bags. It can also be made into a thicker stronger structure which is made into cartons and boxes that provide mechanical protection for many foods. The paperboard can be converted to an even stronger material called corrugated paperboard that is converted into boxes used for logistics. Most types of paper provide a partial
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Engineering Materials Week 3 5.1 Briefly explain the difference between self-diffusion and interdiffusion. Self-diffusion refers to movement of atoms within a pure material; interdiffusion refers to the movement of one or more kind of atoms in a heterogeneous system. 5.7 A sheet of steel 2.5mm thick has nitrogen atmospheres on both sides at 900C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient of nitrogen in steel at 900 C is 1.2 10^-10 m^2/s‚ and the diffusion
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HSC Chemistry Topic 1 PRODUCT ON of MATERIALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. POLYMERS FROM PETROCHEMICALS & BIOMASS 2. ALTERNATIVE FUELS - ETHANOL & THE ALKANOLS 3. REDOX CHEMISTRY & BATTERIES 4. RADIOACTIVITY & ITS USES ...all in the context of society’s use of energy and materials but first) an introduction ... In the previous topic in the Preliminary Course‚ you learnt about carbon chemistry of petroleum Then you
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Recycling is processing used materials into new products to prevent waste of potentially useful materials‚ reduce the consumption of fresh raw materials‚ reduce energy usage‚ reduce water and air pollution. Many kinds of glass‚ paper‚ metal‚ plastic‚ textiles and electronics can be recyclable materials. Goverments encourage their citizens to seperate their garbage and they make some rules for restaurants and supermarkets to supply recycling process. Although it is claimed that recycling is not worth
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N.S Exam Study Notes • Matter&Material • Matter-everything around you‚ it is anything made of atoms and molecules. It’s anything that has a mass. Matter is related to light and electromagnetic radiation. Usually found in a few forms and it has 5 states- (Solids‚Liquids‚Gases‚Plasmas‚Bose Einstein Condensates) • Mass- It is the amount of material in an object. It is the same on Earth or Mars. It is the amount of matter which an object contains. • Weight- It is how heavy something is. It is a
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Engineering Materials Week 2 3.1 What is the difference between atomic structure and crystal structure? Atomic structure relates to the number of protons and neutrons in the nucleus of an atom. Crystal structure pertains to the arrangement of atoms in the crystalline solid material. 3.9 Calculate the radius of a tantalum atom‚ given that Ta has an BCC crystal structure‚ a density of 16.6 g/cm^3‚ and an atomic weight of 180.9 g/mol. For BCC n=2 atoms/unit cell 3.47 Below are shown three different
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since it was written on the 17 of September‚ 1787. Since the constitution is over two hundred years old‚ is it still relevant to the people of the US today? Although the constitution is way older than the people living in the United States‚ it is still relevant because it has an affect on everyone in the United States each and every day. The constitution is important and still relevant today because without it‚ the United States would not be what it is today. The United States government works because
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Assignment On Engineering Materials (Glass) Introduction Glass is a non-crystalline solid material. Glasses are typically brittle‚ and often optically transparent. The most prevalent type of glass‚ used for centuries in windows and drinking vessels‚ is soda-lime glass‚ made of about 75% silica (SiO2) plus Na2O‚ CaO‚ and several minor additives. Often‚ the term glass is used in a restricted sense to refer to this specific use. [pic] [pic]Roman Cage Cup from the 4th century A.D. In
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