physical quantity
quantitative characterization of an aspect of a physical entity, phenomenon, event, process, transformation, relation, system, or substance
electric current density
electric current per area of cross section
luminance
photometric measure of the luminous intensity per area of light travelling in a given direction
chemical affinity
used to describe or characterise elements' or compounds' readiness to form bonds
vascular resistance
resistance that must be overcome to push blood through the circulatory system and create flow
molar volume
volume per amount of substance
specific heat capacity
intensive quantity, heat capacity per mass
mass diffusivity
proportionality constant in some physical laws
arc length
property of a curve
power factor
ratio of active power to apparent power in an AC electrical system
rate of fire
frequency at which a specific weapon can fire or launch its projectiles
metric tensor
symmetric rank (0, 2) tensor field on a smooth manifold
energy density
physical quantity representing the energy per volume
wing loading
total mass divided by area of wing
ionic strength
quantification of the electrical interactions between ions in solution
fugacity
measure of the tendency of a substance to leave a phase
oscillator strength
Dimensionless quantity in spectroscopy
mass transfer coefficient
quotient of mass flux density and mass density
acoustic impedance
quotient of average sound pressure at a surface and sound volume flow rate through that surface
vorticity
pseudovector field in continuum mechanics
equivalent sound level
average sound level for an acoustic event
fetch
the length of water over which a given wind has blown
tare weight
weight of an empty vehicle or container
word size
number of digits in a word in computing
average logarithmic energy decrement
average increase in lethargy per collision of neutrons with atomic nuclei
quantum information
information that is held in the state of a quantum system
environmental factor
any factor, whether abiotic or biotic, that influences living organisms in an ecosystem
isentropic compressibility
negative relative change of volume per change of pressure at constant entropy
depth
horizontal dimension away from the observer
coordinate
number which characterizes position
mass flow
at a point in a fluid, the product of mass density and velocity
inertia tensor
tensorial measure of the rotational inertia with respect to a fixed center of rotation
entropy
property of thermodynamical systems
f-factor
conversion factor used in diagnostic radiology
generalized momentum
in mechanics, a quantity conjugate to generalized coordinates
molecular weight cut-off
in membrane filtration, lowest molecular weight for which 90% of a solute is retained by the membrane
relative permeability
property of porous media
strain rate tensor
physical quantity that describes the rate of change of the deformation of a material
instantaneous electric power
product of instantaneous voltage and electric current
incidence rate
number of occurrences of a medical condition per population and time
area under the curve
statistical technique, with use of the mathematical integration concept to summarize information from a time series of measurements on one individual
mixing ratio
physical / meteorological quantity
electrical elastance
inverse of the electric capacitance