Quantity Kinds

Absorbed dose A dose quantity which is the measure of the energy deposited in matter by ionizing radiation per unit mass.
Action The product of energy and time
Activity Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is …
Activity density No description
Amount-of-substance Number of particles compared to the number of atoms in 0.012 kg of 12C
Amount-of-substance concentration Number of moles of species per liter of solution
Angular frequency Frequency multiplied by 2π. Also called pulsatance. It was formerly called circular frequency.
Angular momentum The product of force, distance and time
Angular velocity A pseudovector representation of how fast the angular position or orientation of an object changes with time. (vector)
Area Quantities that describe the extent of a surface in two dimensions
Bit rate The number of bits that are conveyed or processed per unit of time
Call intensity Number of call attempts per time
Capacitance Stored charge per unit electric potential
Catalytic activity The rate of a enzymatic chemical reaction
Celsius temperature Average kinetic energy per degree of freedom of a system in the Celsius scale.
Channel capacity Tight upper bound on the rate at which information can be reliably transmitted over a communications channel.
Chemical potential The energy that can be absorbed or released due to a change of the particle number of the given species
Damping coefficient An influence within or upon an oscillatory system that has the effect of reducing or preventing its oscillation.
Dimensionless (count) Quantities that have no dimensions
Displacement A displacement is a vector whose length is the shortest distance from the initial to the final position of a point P undergoing motion.
Dose equivalent Equivalent dose is a dose quantity H representing the stochastic health effects of low levels of ionizing radiation on the human body which represents the probability of radiation-induced cancer and genetic damage.
Dynamic viscosity For a laminar flow of a fluid the ratio of the shear stress to the velocity gradient perpendicular to the plane of shear.
Electric charge Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
Electric charge density The quantity of charge per unit volume, measured in the SI system in coulombs per cubic meter (C⋅m−3), at any point in a volume.
Electric conductance Measure for how easily current flows through a material
Electric current Rate of flow of electrical charge per unit time
Electric current density The quantity of charge per unit volume, measured in the SI system in coulombs per cubic meter (C⋅m−3), at any point in a volume.
Electric flux density A vector field that appears in Maxwell's equations. It accounts for the effects of free and bound charge within materials.
Electric polarization The vector field that expresses the density of permanent or induced electric dipole moments in a dielectric material.
Electric potential Energy required to move a unit charge through an electric field from a reference point
Electric potential difference The difference in electric potential between two points.
Electric resistance Resistance to positive hole movement
Energy The amount of energy of a system
Energy density The amount of energy of a system per volume
Energy fluence rate Mass per time cubed
Energy per amount of substance The amount of energy of a system per amount of the substance
Entropy The state of disorder, randomness, or uncertainty of a system.
Force Mass times acceleration
Force per length The force on an object per unit length of the object
Frequency The number of times that a periodic function repeats the same sequence of values during a unit variation of the independent variable
Heat capacity The amount of heat to be supplied to an object to produce a unit change in its temperature.
Heat flow rate The amount of heat that is transferred per unit of time in some material.
Illuminance Luminous flux received by a surface divided by the area of that surface.
Impedance The opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.
Inductance Magnetic flux generated per unit current through a circuit
Information entropy Quantities that measure the level of order or disorder in information content (bits)
Kerma https://en.wikipedia.org/wiki/Kerma_(physics)
Length The one-dimensional extent of an object
Linear density of electric charge The linear charge density can then be understood as the derivative of the charge function with respect to the one dimension of the wire (the position along its length, l) .
Linear stopping power Kinetic energy lost by charged particles traversing a given material per traversed distance.
Luminance solid angle No description
Luminous intensity Wavelength-weighted power of emitted light per unit solid angle
Magnetic H field Unit of magnetic field strength.
Magnetic dipole moment The magnetic strength and orientation of a magnet or other object that produces a magnetic field.
Magnetic flux Measure of magnetism, taking account of the strength and the extent of a magnetic field
Magnetic flux density Measure for the strength of the magnetic field
Magnetic polarization The vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material
Magnetomotive force A quantity appearing in the equation for the magnetic flux in a magnetic circuit, often called Ohm's law for magnetic circuits. It is the property of certain substances or phenomena that give …
Mass A measure of resistance to acceleration
Mass concentration In chemistry, the mass concentration ρ_i (or γ_i) is defined as the mass of a constituent mi divided by the volume of the mixture V.
Mass density Mass of material its volume
Mass per amount-of-substance The mass of one mole of a chemical substance
Massieu function Ψ = Ψ {X1 ... ,Xi, Yi+1, ... Yr}
Molar energy The amount of energy of a system per mole
Molar volume The volume occupied by an amount of a substance (nominally a mole amount)
Permeability The measure of magnetization that a material obtains in response to an applied magnetic field.
Permeance The measure of the quantity of magnetic flux for a number of current-turns.
Permittivity A measure of the electric polarizability of a dielectric. A material with high permittivity polarizes more in response to an applied electric field than a material with low permittivity, thereby storing more …
Planck function The spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T, when there is no net flow of matter or energy between the body …
Power Rate of energy transfer
Pressure Force per unit area
Radiant flux The radiant energy emitted, reflected, transmitted, or received per unit time
Radiant flux density Mass per time cubed
Radiant intensity The radiant flux emitted, reflected, transmitted or received, per unit solid angle.
Reactance The opposition presented to alternating current by inductance or capacitance.[
Reciprocal amount-of-substance Inverse amount-of-substance
Reciprocal length Inverse length
Reciprocal mass Inverse mass
Reciprocal time Inverse time
Relative amount-of-substance An amount of substance(s) [A] relative to another amount of substance(s) [B]
Relative length Quantities that have no overall dimensions but are based on a length ratio (length of A/length of B)
Relative length squared Quantities that have no overall dimensions but are based on an area ratio (area of A/area of B)
Relative luminous flux Quantities that have no overall dimensions but are based on a luminous ratio
Relative mass Quantities that have no overall dimensions but are based on a amount-of-substance ratio)
Relative radiant flux Quantities that have no overall dimensions but are based on a radiant flux ratio
Relative volume Relative amounts of three dimensional volume of objects or space
Repetency Inverse of the wavelength
Resistance to alternating current No description
Resistivity A fundamental property of a material that measures how strongly it resists electric current.
Sound exposure level Sound exposure level (SEL) is a logarithmic measure of the sound exposure of a sound relative to a reference value.
Specific charge capacity Electric charge divided by mass.
Specific energy Energy per unit mass
Specific entropy Entropy divided by mass.
Specific heat capacity Heat capacity divided by mass.
Spectral radiant energy Radiant energy per unit wavelength interval.
Spectral radiant flux No description
Speed The magnitude of a velocity (therefore not directional).
Stress Stress is defined as the force across a "small" boundary per unit area of that boundary, for all orientations of the boundary.
Surface density of electric charge The quantity of charge per unit area, measured in coulombs per square meter (C⋅m−2), at any point on a surface charge distribution on a two dimensional surface.
Surface-activity density No description
Thermodynamic temperature Average kinetic energy per degree of freedom of a system
Time The duration of an event
Torque Monment of force. Sum of moments of forces not acting along the same line.
Velocity Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by …
Volume Three dimensional volume of an object or space
Volume density Volume density is the amount of a quantity (often mass) per unit of volume.
Volume fraction Volume density is the amount of a quantity (often mass) per unit of volume.
Volume per time Movement of a volume of space per unit time