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Example:

P = 42.3 x 10³ W = 42.3 kW

where

P represents the physical quantity for power

42.3 x 10³ is the numerical value

k is the SI prefix kilo representing 10³

W is the symbol for the unit of power, the watt

kW is the kilowatt (= 10³W)

Usually, the symbols of physical quantities are chosen to be a single letter of the Latin or Greek alphabet, printed in italic. Both lower and capital letters are used. Often, the symbols are modified by subscripts or superscripts. If these sub- or superscripts are themselves symbols for physical quantities or numbers, they are printed in italic. Other sub- and superscripts are printed upright (roman).

Examples:

• E_p for potential energy (note: p is upright)
• c_p for heat capacity at constant pressure (note: p represents the physical quantity of pressure and is therefore printed italic)

A quantity is called:

• extensive when its magnitude is additive for subsystems (e.g. volume V or the mass m)
• intensiveIn physics and chemistry, an intensive quantity (also referred to as an intensive variable is a physical quantity whose value does not depend on the amount of the substance for which it is measured. It is the counterpart of an extensive quantity. Properti where the magnitude is independent of the extent of the system (e.g. temperature T, pressure p)

The prefix:

• specific is added to an extensive quantity in order to refer to the quantity divided by its mass (e.g. the specific volume v = V/m)
• molar is added to an extensive quantity to mean divided by amount of substance (e.g. molar volume V_m = V/n).

See also

• List of physical quantitiesList of Physical Quantities some further Physical Quantities yet to be incorporated into the above table (list incomplete) Physics .
• Physical unit
• SI

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Topics: Physical Quantity Printed Pressure Symbols Extensive 42.3...

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Physical quantityA physical quantity is the result of measurement and usually expressed as the product of a numerical value and a physical unit (whereby SI units are usually preferred). Example : P 42. 3 x 103 W 42. 3 kW where P represents the physical quantity for power Physical constantIn science, a physical constant is a physical quantity whose numerical value does not change. It can be contrasted with a mathematical constant, which is a fixed value that does not directly involve a physical measurement. There are many physical constant PhysicalismSee also the old text of this article Physicalism/Larry's text. Physicalism is the metaphysical position that everything is physical; that is, that there are no kinds of things other than physical things. Likewise, physicalism about the mental is a positi Physical eventPhysical events are events that occur in the physical world, including the brain and other parts of the human body. Something that happens in the brain is a physical event. These are to be distinguished from mental events. A comment : an event is an act o Physical chemistryPhysical chemistry is the study of the physical basis of chemical systems and processes. Modern physical chemistry is firmly grounded upon physics. Important areas of study include chemical thermodynamics, chemical kinetics, quantum chemistry, statistical Physical sciencePhysical science is the branch of science including chemistry and physics, and sometimes contrasted with natural or biological science. Physical science includes the sub-branches of aerodynamics, astronomy and astrophysics, classical mechanics, civil engi Physical therapy Physical anthropology Physical unit Physical law Physical space Physical modelling synthesis Physical capital Physical phenomenon Physical Graffiti