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The ratio of two extensive properties of the same object or system is an intensive property. For example, the ratio of an object's mass and volume, which are two extensive properties, is density, which is an intensive property. [9] More generally properties can be combined to give new properties, which may be called derived or composite properties.
Thermodynamic properties and their characteristics Property Symbol Units Extensive? Intensive? Conjugate Potential? Activity: a – Chemical potential: μ i: kJ/mol Particle number N i: Compressibility (adiabatic) β S, κ: Pa −1: Compressibility (isothermal) β T, κ: Pa −1: Cryoscopic constant [1] K f: K·kg/mol Density: ρ: kg/m 3 ...
A material property is an intensive property of a material, i.e., a physical property or chemical property that does not depend on the amount of the material. These quantitative properties may be used as a metric by which the benefits of one material versus another can be compared, thereby aiding in materials selection.
An intensive property does not depend on the size or extent of the system, nor on the amount of matter in the object, while an extensive property shows an additive relationship. These classifications are in general only valid in cases when smaller subdivisions of the sample do not interact in some physical or chemical process when combined.
The density of precious metals could conceivably be based on Troy ounces and pounds, a possible cause of confusion. Knowing the volume of the unit cell of a crystalline material and its formula weight (in daltons), the density can be calculated. One dalton per cubic ångström is equal to a density of 1.660 539 066 60 g/cm 3.
Extensive parameters are properties of the entire system, as contrasted with intensive parameters which can be defined at a single point, such as temperature and pressure. The extensive parameters (except entropy ) are generally conserved in some way as long as the system is "insulated" to changes to that parameter from the outside.
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