dimensionless quantity
81Elastic modulus — An elastic modulus, or modulus of elasticity, is the mathematical description of an object or substance s tendency to be deformed elastically (i.e., non permanently) when a force is applied to it. The elastic modulus of an object is defined as… …
82Coefficient of friction — The coefficient of friction is a dimensionless quantity symbolized by the Greek letter μ and is used to approximate the force of friction. Friction can be viewed, again as an approximation, as being of two primary types, static or kinetic . The… …
83Damping — Classical mechanics Newton s Second Law History of classical mechanics  …
84Particle number — Conjugate variables of thermodynamics Pressure Volume (Stress) (Strain) Temperature Entropy Chemical potential Particle number The particle number (or number of particles) of a thermodynamic system …
85Permeability (electromagnetism) — Magnetic Circuits Conventional Magnetic Circuits Magnetomotive force Magnetic flux Φ Magnetic reluctance Phasor Magnetic Circuits Complex reluctance Zμ …
86Supercritical flow — A supercritical flow is when the flow velocity is larger than the wave velocity. The analogous condition in gas dynamics is supersonic.Information travels at the wave velocity. This is the velocity at which waves travel outwards from a pebble… …
87Refractometry — is the method of measuring substances refractive index (one of their fundamental physical properties) in order to, for example, assess their composition or purity. A refractometer is the instrument used to measure refractive index ( RI ).… …
88Sackur–Tetrode equation — The Sackur–Tetrode equation is an expression for the entropy of a monatomicclassical ideal gas which uses quantum considerations to arriveat an exact formula. Classical thermodynamics can only give the entropy of a classical ideal gas to within a …
89IRI — may refer to:* The Islamic Republic of Iran * Internationalized Resource Identifier, a generalization of the Uniform Resource Locator (URL), a World Wide Web resource allowing the use of Unicode * International Roughness Index, a dimensionless… …
90Sheet resistance — is a measure of resistance of thin films that are namely uniform in thickness. It is commonly used to characterize materials made by semiconductor doping, metal deposition, resistive paste printing, and glass coating. Examples of these processes… …
