Physical property
 | This articleneeds additional citations forverification.(March 2017) |
Aphysical propertyis anypropertyof a physical system that ismeasurable.[1]The changes in the physical properties of a system can be used to describe its changes between momentary states. Aquantifiablephysical property is calledphysical quantity.Measurablephysical quantities are often referred to asobservables. Some physical properties arequalitative,such asshininess,brittleness,etc.; some general qualitative properties admit more specific related quantitative properties, such as inopacity,hardness,ductility,viscosity,etc.
Physical properties are often characterized asintensive and extensive properties.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.
Properties may also be classified with respect to the directionality of their nature. For example,isotropicproperties do not change with the direction of observation, andanisotropicproperties do have spatial variance.
It may be difficult to determine whether a given property is a material property or not.Color,for example, can be seen and measured; however, what one perceives as color is really an interpretation of the reflective properties of a surface and the light used to illuminate it. In this sense, many ostensibly physical properties are calledsupervenient.A supervenient property is one which is actual, but is secondary to some underlying reality. This is similar to the way in which objects are supervenient on atomic structure. A cup might have the physical properties of mass, shape, color, temperature, etc., but these properties are supervenient on the underlying atomic structure, which may in turn be supervenient on an underlying quantum structure.
Physical properties are contrasted withchemical propertieswhich determine the way a material behaves in achemical reaction.
List of properties[edit]
The physical properties of an object that are traditionally defined byclassical mechanicsare often called mechanical properties. Other broad categories, commonly cited, are electrical properties, optical properties, thermal properties, etc. Examples of physical properties include:[2]
- absorption (physical)
- absorption (electromagnetic)
- albedo
- angular momentum
- area
- brittleness
- boiling point
- capacitance
- color
- concentration
- density
- dielectric
- ductility
- distribution
- efficacy
- elasticity
- electric charge
- electrical conductivity
- electrical impedance
- electric field
- electric potential
- emission
- flow rate (mass)
- flow rate (volume)
- fluidity
- frequency
- hardness
- heat capacity
- inductance
- intrinsic impedance
- intensity
- irradiance
- length
- location
- luminance
- luminescence
- luster
- malleability
- magnetic field
- magnetic flux
- mass
- melting point
- moment
- momentum
- opacity
- permeability
- permittivity
- plasticity
- pressure
- radiance
- resistivity
- reflectivity
- refractive index
- spin
- solubility
- specific heat
- strength
- stiffness
- temperature
- tension
- thermal conductivity(andresistance)
- velocity
- viscosity
- volume
- wave impedance
See also[edit]
References[edit]
- ^Mark, Burgin (2016-10-27).Theory Of Knowledge: Structures And Processes.World Scientific.ISBN9789814522694.Archivedfrom the original on 2017-12-25.
- ^"Physical Properties".Department of Chemistry - Elmhurst College.Archivedfrom the original on 2016-11-19.Retrieved2017-01-17.
Bibliography[edit]
- Cesare Emiliani (1987).Dictionary of the Physical Sciences: Terms, Formulas, Data.Oxford University Press.ISBN978-0-19-503651-0.
- Robert A. Meyers (2001).Encyclopedia of Physical Science and Technology(3rd ed.).Academic Press.
External links[edit]
- Physical and Chemical Property Data SourcesArchived2011-08-04 at theWayback Machine– a list of references which cover several chemical and physical properties of various materials
