physical quantity
quantitative characterization of an aspect of a physical entity, phenomenon, event, process, transformation, relation, system, or substance
sound power
surface integral over the sound intensity
spatial frequency
characteristic of any structure that is periodic across position in space; measure of how often sinusoidal components (as determined by the Fourier transform) of the structure repeat per unit of distance
catalytic activity
measure for the rate at which a catalysts transforms an educt to products
period
smallest temporal unit after which a process repeats
hydraulic conductivity
measure of the ability of a porous material to allow water to pass through it
dose rate
quantity of radiation absorbed or delivered per time
proper length
length of an object in the object's rest frame
London penetration depth
distance to which a magnetic field penetrates into a superconductor
angle excess
in spherical trigonometry
Hildebrand solubility parameter
Type of paramter
remanence
magnetization that remains in material after an external magnetic force has been removed
zero-point energy
lowest possible energy of a quantum system or field
angular momentum of light
physical quantity carried in photons
effective dose
measure of the cancer risk to a whole organism due to ionizing radiation
mechanical impedance
quotient of force and resulting speed in the same direction
sound particle acceleration
instantaneous acceleration of a sound particle
path length
physical quantity
Q value
the differences of energies of the parent nuclides to the daughter nuclides
spectral sensitivity
relative efficiency of detection of a signal as a function of its frequency or wavelength
Transactions per second
usually in database management
sound pressure level
local pressure deviation from the ambient pressure, caused by a sound wave
magnetic pole strength
magnetic moment divided by the separation between the poles
relativistic angular momentum
angular momentum in special and general relativity
pressure altitude
altitude imputed based on observed barometric pressure using the International Standard Atmosphere model
moment of force
vector product of the position vector with respect to the axis of rotation and the force
rainfall intensity
measure of the amount of rain received in a defined area over a defined period of time
spatial gradient
in mathematics, a gradient whose components are spatial derivatives with respect to the position coordinates
vertical separation
altitude difference between two geographical points
electric charge density
electric charge per volume
volume strain
quotient of change of volume and original volume
mass concentration of water vapour
mass of the contained water vapour per volume
characteristic acoustic impedance
quotient of sound pressure and the component of the sound particle velocity in the direction of wave propagation
acoustic admittance
measure of flow of acoustic energy
electric charge
physical property that quantifies an object's interaction with electric fields
phase velocity
rate at which the phase of the wave propagates in space
electrical resistance
opposition to the passage of an electric current
mass density
mass of a sample, material or body divided by its volume
damping ratio
dimensionless measure describing how oscillations in a system decay after a disturbance
volume
quantity of three-dimensional space
ultimate tensile strength
capacity of a material or structure to withstand loads tending to elongate; resists tension (being pulled apart); measured by the maximum stress that a material can withstand while being stretched or pulled before breaking