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Standard symbol Definition Field of application Coefficient of determination: statistics (proportion of variance explained by a statistical model) Coefficient of variation: statistics (ratio of standard deviation to expectation) Correlation: ρ or r
newton meter squared per kilogram squared (N⋅m 2 /kg 2) shear modulus: pascal (Pa) or newton per square meter (N/m 2) acceleration due to gravity: meters per second squared (m/s 2), or equivalently, newtons per kilogram (N/kg) magnetic field strength: ampere per meter (A/m) Hamiltonian: joule (J)
The set of real numbers, sometimes called "the reals", is traditionally denoted by a bold R, often using blackboard bold, . [2] [3] The adjective real, used in the 17th century by René Descartes, distinguishes real numbers from imaginary numbers such as the square roots of −1. [4]
L 2 T −3: Action: S: Momentum of particle multiplied by distance travelled J/Hz L 2 M T −1: scalar Angular acceleration: ω a: Change in angular velocity per unit time rad/s 2: T −2: Area: A: Extent of a surface m 2: L 2: extensive, bivector or scalar Area density: ρ A: Mass per unit area kg⋅m −2: L −2 M: intensive Capacitance: C ...
The molar gas constant (also known as the gas constant, universal gas constant, or ideal gas constant) is denoted by the symbol R or R. It is the molar equivalent to the Boltzmann constant, expressed in units of energy per temperature increment per amount of substance, rather than energy per temperature increment per particle.
Quantities, Units and Symbols in Physical Chemistry, also known as the Green Book, is a compilation of terms and symbols widely used in the field of physical chemistry. It also includes a table of physical constants , tables listing the properties of elementary particles , chemical elements , and nuclides , and information about conversion ...
In quantum chemical calculations, the electron density, ρ(r), is a function of the coordinates r, defined so ρ(r)dr is the number of electrons in a small volume dr. For closed-shell molecules, ρ ( r ) {\displaystyle \rho (\mathbf {r} )} can be written in terms of a sum of products of basis functions, φ:
2.58 × 10 −4 A⋅s/kg The roentgen or röntgen ( / ˈ r ɛ n t ɡ ə n , - dʒ ə n , ˈ r ʌ n t -/ ; [ 2 ] symbol R ) is a legacy unit of measurement for the exposure of X-rays and gamma rays , and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air ( statcoulomb per kilogram).