What is hydrocarbon? A compound of hydrogen and carbon‚ such as any of those that are the chief components of petroleum and natural gas OR Organic compound (such as benzene‚ methane‚ paraffin) made of two elements carbon and hydrogen and found in coal‚ crude oil‚ natural gas‚ and plant life. Hydrocarbons are used as fuels solvents‚ and as raw materials for numerous products such as dyes‚ pesticides‚ and plastics; petroleum is a mixture of several hydrocarbons
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An intensive property is a bulk property‚ meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties are the temperature and the hardness of an object. No matter how small a diamond is cut‚ it maintains its intrinsic hardness. By contrast‚ an extensive property is one that is additive for independent‚ noninteracting subsystems.[1] The property is proportional to the amount of material in the
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temperature sensor which measures temperature using the principle that the resistance of a metal changes with temperature. Theory Behind RTD • Classification of materials: – Conductors – tends to increase their resistivity with an increase in temperature – Insulators – tends to decrease resistivity with an increase in temperature • Free electrons - migrates – Conductors – many free electrons – Insulators – hardly any free electrons • The effect of heat – makes atom vibrates – Conductors • Causes
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Conductivity in metal-organic frameworks Metal–organic frameworks (MOFs)‚ are a class of crystalline materials whose crystal structure is made up from metal-containing clusters connected by multidentate organic linkers1‚2. MOFs are attracting considerable attention due to the possible rational design of crystal structures of coordination frameworks with versatile metal ions and organic ligands. In principle‚ MOFs topologies along with intermolecular distances between various building blocks can be
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FREE ELECTRON THEORY Classical free electron theory of metals This theory was developed by Drude and Lorentz and hence is also known as Drude-Lorentz theory. According to this theory‚ a metal consists of electrons which are free to move about in the crystal like molecules of a gas in a container. Mutual repulsion between electrons is ignored and hence potential energy is taken as zero. Therefore the total energy of the electron is equal to its kinetic energy. Drift velocity If no electric
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495.8 kJ·mol−1 2nd: 4562 kJ·mol−1 3rd: 6910.3 kJ·mol−1 Atomic radius 186 pm Covalent radius 166±9 pm Van der Waals radius 227 pm Miscellanea Crystal structure body-centered cubic Magnetic ordering paramagnetic[1] Electrical resistivity (20 °C) 47.7 nΩ·m Thermal conductivity 142 W·m−1·K−1 Thermal expansion (25 °C) 71 µm·m−1·K−1 Speed of
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are forced around a wedge-shaped obstacle in one direction or another‚ corresponding to a logical 1 or 0. Angela Intermite The rise of graphene‚ 18/10/2010 8/16 Electronic transport • High electron mobility: 15.000 cm2 V-1 s-1 • Resistivity 10-6 cm < silver • Minimum conductivity on the order of 4e2/h Angela Intermite The rise of graphene‚ 18/10/2010 9/16
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is in fact better described as a poor conductor or a substance of high resistance to the flow of electric current. Different insulating and conducting materials are compared with each other in this regard by means of a material constant known as resistivity. Examples of insulators are plastics‚ styrofoam‚ paper‚ rubber‚ glass and dry air among others. These are
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Due to the discovery of shock metamorphism rocks (suevite breccia) and melted original rocks scattering in the southern area of Bukit Bunuh‚ it was suspected that the area had the possibility of being impacted by meteorite. The founded boulders made the archaeologists from the Centre for Global Archaeological Research (CGAR) of Universiti Sains Malaysia (USM) to propose of the possibility of Bukit Bunuh as a meteorite impact site. This proposal was led to intense research in the area by utilizing
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Corrosion Control and Monitoring ABC Company ABC Chemical Complex Engineering Specification ABC Chemical Complex 1 Corrosion Control & Monitoring SCOPE – This Engineering Specification includes external and internal corrosion control and monitoring for DOT regulated pipelines. – Design‚ construction‚ construction inspection‚ construction acceptance‚ operation‚ and maintenance of DOT regulated pipelines are covered by this Engineering Specification. ABC Chemical Complex 2 Corrosion Control
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