HOME  TheInfoList.com 
Polycarbonate Polycarbonates (PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many applications. Polycarbonates do not have a unique resin identification code (RIC) and are identified as "Other", 7 on the RIC list [...More...]  "Polycarbonate" on: Wikipedia Yahoo 

Megahertz The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units International System of Units (SI) and is defined as one cycle per second.[1] It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves. Hertz Hertz are commonly expressed in multiples: kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), and terahertz (1012 Hz, THz). Some of the unit's most common uses are in the description of sine waves and musical tones, particularly those used in radio and audiorelated applications [...More...]  "Megahertz" on: Wikipedia Yahoo 

Watt The watt (symbol: W) is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second,[1] and is used to quantify the rate of energy transfer [...More...]  "Watt" on: Wikipedia Yahoo 

Milli Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10−3).[1] Proposed in 1793[2] and adopted in 1795, the prefix comes from the Latin Latin mille, meaning "one thousand" (the Latin Latin plural is milia) [...More...]  "Milli" on: Wikipedia Yahoo 

Gram The gram (alternative spelling: gramme;[1] SI unit symbol: g) (Latin gramma, from Greek γράμμα, grámma) is a metric system unit of mass. Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice"[2] (later at 4 °C, the temperature of maximum density of water) [...More...]  "Gram" on: Wikipedia Yahoo 

Rotation A rotation is a circular movement of an object around a center (or point) of rotation. A threedimensional object can always be rotated around an infinite number of imaginary lines called rotation axes (/ˈæksiːz/ AKseez). If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin. A rotation about an external point, e.g. the Earth Earth about the Sun, is called a revolution or orbital revolution, typically when it is produced by gravity. The axis is called a pole.Contents1 Mathematics 2 Astronomy2.1 Rotation Rotation and revolution 2.2 Retrograde rotation3 Physics3.1 Cosmological principle 3.2 Euler rotations4 Flight dynamics 5 Amusement rides 6 Sports 7 Fixed axis vs [...More...]  "Rotation" on: Wikipedia Yahoo 

Coefficient Of Friction Friction Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.[2] There are several types of friction:Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between nonmoving surfaces, and kinetic friction between moving surfaces [...More...]  "Coefficient Of Friction" on: Wikipedia Yahoo 

Speed Of Sound The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C (32 °F), the speed of sound is 331.2 metres per second (1,087 ft/s; 1,192 km/h; 741 mph; 644 kn). At 20 °C (68 °F), the speed of sound is 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s. The speed of sound in an ideal gas depends only on its temperature and composition. The speed has a weak dependence on frequency and pressure in ordinary air, deviating slightly from ideal behavior. In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance: sound travels most slowly in gases; it travels faster in liquids; and faster still in solids [...More...]  "Speed Of Sound" on: Wikipedia Yahoo 

Heat Deflection Temperature The heat deflection temperature or heat distortion temperature (HDT, HDTUL, or DTUL) is the temperature at which a polymer or plastic sample deforms under a specified load. This property of a given plastic material is applied in many aspects of product design, engineering and manufacture of products using thermoplastic components. Determination[edit] The heat distortion temperature is determined by the following test procedure outlined in ASTM D648. The test specimen is loaded in threepoint bending in the edgewise direction. The outer fiber stress used for testing is either 0.455 MPa or 1.82 MPa, and the temperature is increased at 2 °C/min until the specimen deflects 0.25 mm. This is similar to the test procedure defined in the ISO 75 standard. Limitations that are associated with the determination of the HDT is that the sample is not thermally isotropic and, in thick samples in particular, will contain a temperature gradient [...More...]  "Heat Deflection Temperature" on: Wikipedia Yahoo 

Vicat Softening Point Vicat softening temperature or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as plastics. It is taken as the temperature at which the specimen is penetrated to a depth of 1 mm by a flatended needle with a 1 mm2 circular or square crosssection. For the Vicat A test, a load of 10 N is used. For the Vicat B test, the load is 50 N. Standards to determine Vicat softening point Vicat softening point include ASTM ASTM D 1525 and ISO 306, which are largely equivalent.[1] Property information for specific grades of resin are available in the Prospector Plastic Database. Property Search lets you search for plastics by more than 400 material properties [...More...]  "Vicat Softening Point" on: Wikipedia Yahoo 

Newton (unit) The newton (symbol: N) is the International System of Units International System of Units (SI) derived unit of force. It is named after Isaac Newton Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion. See below for the conversion factors.Contents1 Definition 2 Examples 3 Commonly seen as kilonewtons 4 Conversion factors 5 See also 6 Notes and referencesDefinition[edit] One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in direction of the applied force. In 1946, Conférence Générale des Poids et Mesures (CGPM) Resolution 2 standardized the unit of force in the MKS system of units to be the amount needed to accelerate 1 kilogram of mass at the rate of 1 metre per second squared [...More...]  "Newton (unit)" on: Wikipedia Yahoo 

Thermal Conductivity Thermal conductivity Thermal conductivity (often denoted k, λ, or κ) is the property of a material to conduct heat. It is evaluated primarily in terms of the Fourier's Law for heat conduction. In general, thermal conductivity is a tensor property, expressing the anisotropy of the property. Heat transfer Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature [...More...]  "Thermal Conductivity" on: Wikipedia Yahoo 

Kelvin The Kelvin Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics. The kelvin (symbol: K) is the base unit of temperature in the International System of Units International System of Units (SI). The kelvin is defined as the fraction 1⁄273.16 of the thermodynamic temperature of the triple point of water (exactly 0.01 °C or 32.018 °F).[1] In other words, it is defined such that the triple point of water is exactly 273.16 K. The Kelvin Kelvin scale is named after the Belfastborn, Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin (1824–1907), who wrote of the need for an "absolute thermometric scale". Unlike the degree Fahrenheit Fahrenheit and degree Celsius, the kelvin is not referred to or typeset as a degree [...More...]  "Kelvin" on: Wikipedia Yahoo 

Density The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:[1] ρ = m V displaystyle rho = frac m V where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume,[2] although this is scientifically inaccurate – this quantity is more specifically called specific weight. For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging [...More...]  "Density" on: Wikipedia Yahoo 

Specific Heat Capacity Heat Heat capacity or thermal capacity is a measurable physical quantity equal to the ratio of the heat added to (or removed from) an object to the resulting temperature change.[1] The unit of heat capacity is joule per kelvin J K displaystyle mathrm tfrac J K , or kilogram metre squared per kelvin second squared k g ⋅ m 2 K ⋅ s 2 displaystyle mathrm tfrac kgcdot m^ 2 Kcdot s^ 2 in the International System of Units International System of Units (SI). The dimensional form is L2MT−2Θ−1 [...More...]  "Specific Heat Capacity" on: Wikipedia Yahoo 

Kilogram The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units International System of Units (SI), and is defined as being equal to the mass of the International Prototype of the Kilogram Kilogram (IPK, also known as "Le Grand K" or "Big K"),[2] a cylinder of platinumiridium alloy stored by the International Bureau of Weights and Measures International Bureau of Weights and Measures at SaintCloud, France. The kilogram was originally defined as the mass of a litre (cubic decimetre) of water at its freezing point. That was an inconvenient quantity to precisely replicate, so in the late 18th century a platinum artefact was fashioned as a standard for the kilogram [...More...]  "Kilogram" on: Wikipedia Yahoo 