physical quantity
quantitative characterization of an aspect of a physical entity, phenomenon, event, process, transformation, relation, system, or substance
stress intensity factor
factor in fracture mechanics
spectral power distribution
power per unit area per unit wavelength of a wavelength concentration, important for a substance's transmittance, reflectivity, and absorbance
magnitude
logarithmic measure of the brightness of an astronomical object
proper acceleration
physical acceleration experienced by an object
true anomaly
angular parameter of Keplerian orbits
particle current density
number of particles per time and area crossing a surface
static pressure
pressure in the absence of sound waves
inflation rate
economic indicator
specific activity
activity per mass of a radioactive sample
paper density
mass per unit volume
power density
power per volume
thickness
extent from one surface to the opposite, usually in the smallest solid dimension
Lorentz scalar
quantity in the theory of relativity which is invariant under a Lorentz transformation
apparent viscosity
in fluid mechanics, shear stress divided by shear rate
committed dose
measure of radiation health risk
heat capacity rate
product of specific heat and mass flow rate
immittance
combined measure of impedance and admittance
Mooney viscosity
a measure of viscosity of rubber measured using Mooney viscometer
proper velocity
alternative to velocity for measuring motion in relativity theory
stationary orbit
orbit of an astronomical body where the orbiting object remains over the same location on the surface
compressibility
measure of the relative volume change of a fluid or solid as a response to a pressure change
heat flow rate
rate of transfer of energy as heat
potential
in mathematics and physics, field defined in space, from which many important physical properties may be derived
moment
product of a distance and a physical quantity
correlated colour temperature
property of light stimulus related to human perception
flux density
amount of a physical field passing through a point at a time
specific yield
a ratio indicating the volumetric fraction of the bulk aquifer volume that a given aquifer will yield when all the water is allowed to drain out of it under the forces of gravity
energy fluence rate
in nuclear physics, time derivative of the energy fluence
Cartesian coordinate
coordinate in a Cartesian coordinate system
kinetic friction factor
ratio of the force component in the direction of motion to the contact force of a sliding body
mutual inductance
physical quantity
absorption coefficient
measure for the exponential reduction of a quantity along a path due to absorption
angular speed
rate of change of angle
atomic number
number of protons found in the nucleus of an atom
magnetic field strength
strength of a magnetic field
pitch
perceptual property in music ordering sounds from low to high
apparent magnitude
measure of brightness for celestial objects, as seen from Earth
geothermal energy
thermal energy generated and stored in the Earth
enthalpy
measure of energy in a thermodynamic system; thermodynamic quantity equivalent to the total heat content of a system
surface tension
tendency of a liquid surface to shrink to reduce surface area
orbital eccentricity
parameter that determines the amount by which an orbit deviates from a perfect circle
magnetic moment
product of the electric current through a loop, the area enclosed by the loop and the unit vector perpendicular to the loop
electrical conductance
reciprocal of electrical resistance
sound particle velocity
time derivative of the sound particle displacement
sheet resistance
measure of electrical resistance of a thin film of uniform thickness
root-mean-square value
root mean square value of a specific variable in context of electronics, acoustics, etc.
towing capacity
the towing/pulling capacity of a vehicle, specially trucks