Concept
Physical property
Overview
A physical property is any property of a physical system that is measurable. The changes in the physical properties of a system can be used to describe its changes between momentary states. A quantifiable physical property is called physical quantity. Measurable physical quantities are often referred to as observables.
Some physical properties are qualitative, such as shininess, brittleness, etc.; some general qualitative properties admit more specific related quantitative properties, such as in opacity, hardness, ductility, viscosity, etc.
Physical properties are often characterized as intensive 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, isotropic properties do not change with the direction of observation, and anisotropic properties do have directional 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 called supervenient. 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 with chemical properties which determine the way a material behaves in a chemical reaction. The term physicochemical property is often used to describe physical properties that are especially relevant to the field of chemistry.
Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).
Possible passages
Found by search and not yet checked by a person; they may only mention the idea in passing.
Still more strongly will a similar presumption exist, when the object itself, as in the case of organized beings, is no primeval agent, but an effect, which depends on a cause or causes for its very existence. The Kinds, therefore, which are called in chemistry simple substances, or elementary natural agents, are the only ones, any of whose properties can with certainty be considered ultimate; and of these the…
John Stuart Mill, A System of Logic, Ratiocinative and Inductive
States what Physical property is.
Some of the Muʻtazilah hold that there are cases in which the absence of a physical property is not a real property, that weariness is the absence of strength, and ignorance the absence of knowledge; but this cannot be said in every case of negative properties: it cannot be said that darkness is the mere absence of light, or that rest is the absence of motion. Some negative properties are thus considered by them as…
Moses Maimonides, The guide for the perplexed
States what Physical property is; names Physical property.
The former we call soft, the latter hard, bodies. In some bodies the parts are so very easily separable, that they not only yield to a very moderate pressure, but easily receive the pressing body within them, and without much resistance allow it to traverse their extent in every possible direction. These are called Fluid, in contradistinction to those of which the parts not being so easily separable, are upon that…
Adam Smith, The Essays of Adam Smith
States what Physical property is.
Philosophers who discussed Physical property
Related ideas
- Mass
- Classical mechanics
- Momentum
- Velocity
- Supervenience
- Property (philosophy)
- Chemistry
- Color
- Quantity
- Chemical property
- Qualitative property
Place in the tradition
Part of American philosophy.