physical quantity
quantitative characterization of an aspect of a physical entity, phenomenon, event, process, transformation, relation, system, or substance
electromagnetic energy density
physical quantity
active energy
integral of the electric instantaneous power over a time interval
particle number density
mean number of particles per volume
force
physical influence that tends to cause an object to change motion unless opposed by other forces
mass
property of matter to resist changes of the state of motion and to attract other bodies
longitude
geographic coordinate that specifies the east-west position of a point on the Earth's surface
momentum
conserved physical quantity related to the motion of a body
wavelength
spatial period of the wave; the distance over which the wave's shape repeats; the inverse of the spatial frequency
quantum
minimum positive amount of any physical property involved in an interaction
distance
length of straight line that connects two points in a measurable space or in an observable physical space
body mass index
measure of relative weight based on an individual's mass and height
Mach number
ratio of speed of object moving through fluid and speed of sound
impedance
quotient of the voltage phasor and the electric current phasor
interest rate
percentage of a sum of money charged for its use
molecular mass
sum of atomic masses of all atoms in a molecule
tidal energy
technology to convert the energy from tides into useful forms of power
time per unit
term from the production technology
elastic modulus
physical property that measures the stiffness of an elastic material
electric reactance
a circuit element's opposition to changes in electric current due to its inductance or capacitance
permittivity
physical quantity, measure of the resistance to the electric field
quantum number
notation for conserved quantities in physics and chemistry
color temperature
property of light sources related to black-body radiation
positive pressure
pressure minus ambient pressure
magnetic pressure
energy density associated with a magnetic field
thermal conductivity
capacity of a material to conduct heat
optical density
term in photography
mass concentration
mass density of a component in a chemical mixture
adiabatic lapse rate
Vertical rate of change of temperature in atmosphere, assuming no heat exchange
gyromagnetic ratio
ratio of magnetic dipole moment to total angular momentum
wave vector
vector pointing in the direction of a wave and whose magnitude is equal to the wavenumber
pre-exponential factor
pre-exponential constant in the Arrhenius equation in Chemical Kinetics
mass-to-charge ratio
physical quantity of interest in chemistry and electrodynamics
mass fraction
ratio of one substance's mass to the mass of the total mixture
thermal resistance
objects' resistance to heat transfer; reciprocal of thermal conductance
ozone depletion potential
relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane being fixed at an ODP of 1.0
pixel density
screen resolution measured in pixels per length
elastic limit
Mechanical limit
intensive or extensive property
property (of a system or substance) that is intensive or is extensive
specific absorption rate
rate at which energy is absorbed by the human body when exposed to electromagnetic field
Hall coefficient
in an isotropic conductor, the relation between electric field strength and current density
Seebeck coefficient
measure of voltage induced by change of temperature
twist of a shaft
axial periodic surface structures on shaft
rotational speed
physical quantity
velocity factor
ratio of the speed at which a wavefront passes through the medium to the speed of light in a vacuum
mass flow rate
mass per time of a fluid passing through a cross section
heat flux density
heat transferred per area and time
mass ratio
ratio of the masses of two mixture components