physical quantity
quantitative characterization of an aspect of a physical entity, phenomenon, event, process, transformation, relation, system, or substance
power quantity
physical quantity proportional to power
field strength
physical quantity
rapidity
physical quantity, defined as arctangent of speed (divided by the speed of light)
form factor
characterizing the functional form of oscillating signals
sound volume velocity
surface integral of the sound particle velocity
volume ratio
physical quantity
inertance
measure of the pressure difference in a fluid required to cause a unit change in the rate of change of volumetric flow-rate with time, whose SI unit is kg/m⁴
linear energy transfer
measure for the energy lost by charged particles per traversed distance, including only interactions up to a given energy
mean effective pressure
physical quantity
surface power density
power per area
mass attenuation coefficient
quotient of the linear photon attenuation coefficient and the mass density
phase angle
angle between incident and reflected light in astronomy
areal velocity
term from classical mechanics
magnetic vector potential
vector field whose curl is the magnetic flux density
linear electric current density
physical quantity
nuclear cross section
concept in particle physics
thermal insulance
inverse of the heat transfer coefficient
strain tensor
symmetric tensor quantity of the strain caused by stress in matter
luminosity
number of particles per unit area per unit time times the opacity of the target
relative permittivity
ratio of permittivity to the electric constant
energy flux density
energy transferred through a surface per time and area
headway
distance or duration between vehicles in transport operation
photometric quantity
physical quantity taking into account the response of the human visual system
scaling dimension
in quantum field theory, the eigenvalue of a local operator under spacetime dilatations
displacement
ship's weight
osmotic coefficient
quantity characterizing the deviation of a solvent from ideal behavior
Specific kinetic energy
fundamental concept in physics
standard pressure
chosen value of pressure, 10⁵ Pa
photon radiance
area density of the photon intensity in a specified direction
normal stress
force component perpendicular to a surface element divided by the area of that surface element
decay constant
in nuclear physics, quotient of the relative number of decayed atomic nuclei and the duration
water resistance
a feature that makes subject relatively unaffected by water
number of configurations
number of microscopic configurations of equal probability of a macroscopic system
cross section
measure of probability that a specific process will take place in a collision of two particles
elastance
ratio of pressure change per volume change in some elastic system
photon energy
energy carried by a single photon
surface temperature
temperature at the surface of a body
Celsius temperature
physical quantity