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Physical quantity

A physical quantity (or simply quantity)[1][a] is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as a value, which is the algebraic multiplication of a numerical value and a unit of measurement. For example, the physical quantity mass, symbol m, can be quantified as m=n kg, where n is the numerical value and kg is the unit symbol (for kilogram). Quantities that are vectors have, besides numerical value and unit, direction or orientation in space.

Real numbers, such as 1 or 2,

e, the base of ,

natural logarithms

i, the unit,

imaginary

π for the ratio of a circle's circumference to its diameter, 3.14159265...

δx, Δy, dz, representing differences (finite or otherwise) in the quantities x, y and z

sin α, sinh γ, log x

Support[edit]

Scalars[edit]

A scalar is a physical quantity that has magnitude but no direction. Symbols for physical quantities are usually chosen to be a single letter of the Latin or Greek alphabet, and are printed in italic type.

Vectors[edit]

Vectors are physical quantities that possess both magnitude and direction and whose operations obey the axioms of a vector space. Symbols for physical quantities that are vectors are in bold type, underlined or with an arrow above. For example, if u is the speed of a particle, then the straightforward notations for its velocity are u, u, or .

Tensors[edit]

Scalars and vectors are the simplest tensors, which can be used to describe more general physical quantities. For example, the Cauchy stress tensor possesses magnitude, direction, and orientation qualities.

List of physical quantities

List of photometric quantities

List of radiometric quantities

Philosophy of science

Quantity

Observable quantity

Cook, Alan H. The observational foundations of physics, Cambridge, 1994.  0-521-45597-9

ISBN

Essential Principles of Physics, P.M. Whelan, M.J. Hodgson, 2nd Edition, 1978, John Murray,  0-7195-3382-1

ISBN

Encyclopedia of Physics, , G.L. Trigg, 2nd Edition, VHC Publishers, Hans Warlimont, Springer, 2005, pp 12–13

R.G. Lerner

Physics for Scientists and Engineers: With Modern Physics (6th Edition), P.A. Tipler, G. Mosca, W.H. Freeman and Co, 2008, 9-781429-202657

project in C# Language and Delphi Language

DEVLIB

Archived 2014-01-01 at the Wayback Machine project in C# Language at Code Plex

Physical Quantities

Archived 2014-01-01 at the Wayback Machine project in C# Language at Code Plex

Physical Measure C# library

Archived 2014-01-01 at the Wayback Machine project in C# Language at Code Plex

Ethical Measures

online calculation and scripting tool supporting physical quantities.

Engineer JS