Part 3: Space and Time13 of 42 entries
3-1.1
lengthl
linear extent in space between any two points
3-1.2
width, breadthb
minimum length of a straight line segment between two parallel straight lines (in two dimensions) or planes (in three…
3-1.3
height, depth, altitudeh
minimum length of a straight line segment between a point and a reference line or reference surface
3-1.4
thicknessd
width (t3-1.2)
3-1.5
diameterd
width (t3-1.2) of a circle, cylinder or sphere
3-1.6
radiusr
half of a diameter (t3-1.5)
3-1.7
path length, arc lengths
length of a rectifiable curve between two of its points
3-1.8
distanced
shortest path length (t3-1.7) between two points in a metric space
3-1.9
radial distancer_Q
distance (t3-1.8), where one point is located on an axis or within a closed non self-intersecting curve or surface
3-1.10
position vectorr
vector (iso80000-2) quantity from the origin of a coordinate system to a point in space
3-1.11
displacementDelta r
vector (iso80000-2) quantity between any two points in space
3-1.12
radius of curvaturerho
radius (t3-1.6) of the osculating circle of a planar curve at a particular point of the curve
3-19
wavelengthlambda
length (t3-1.1) of the repetition interval of a wave
ent
Part 6: Electromagnetism1 of 85 entries
Part 8: Acoustics1 of 18 entries
Part 9: Physical Chemistry1 of 62 entries
Part 10: Atomic and Nuclear12 of 125 entries
10-6
Bohr radiusa_0
radius (iso80000-3) of the electron orbital in the hydrogen atom in its ground state in the Bohr model of the atom:…
ent
10-17
gyroradius, Larmor radiusr_"g"
radius (iso80000-3) of circular movement of a particle with mass (iso80000-4), velocity (iso80000-3), and electric…
10-19.1
nuclear radiusR
conventional radius (iso80000-3) of sphere in which the nuclear matter is included
10-19.2
electron radiusr_"e"
radius of a sphere such that the relativistic electron energy is distributed uniformly: where is the elementary charge…
ent
10-20
Compton wavelengthlambda_"C"
quotient of the Planck constant and the product of the mass of the particle and the speed of light in vacuum: where is…
10-53
half-value thicknessd_(1//2)
thickness (iso80000-3) of the attenuating layer that reduces the quantity of interest of a unidirectional beam of…
10-56
mean linear rangeR
mean total rectified path length (iso80000-3) travelled by a particle in the course of slowing down to rest in a given…
10-65
diffusion coefficient for fluence rateD_Phi
proportionality constant between the particle current density (t10-48) and the gradient of the particle fluence rate…
10-71
mean free path <atomic physics>l
average distance (iso80000-3) that particles travel between two successive specified reactions or processes
10-73.1
slowing-down lengthL_"s"
square root of the slowing down area (t10-72.1):
10-73.2
diffusion length <atomic physics>L
square root of the diffusion area (t10-72.2):
10-73.3
migration lengthM
square root of the migration area (t10-72.3):
Part 12: Condensed Matter13 of 60 entries
12-1.1
lattice vectorbb(ii(R))
translation vector that maps the crystal lattice on itself
ent
12-1.2
fundamental lattice vectorsbb(ii(a))_1, bb(ii(a))_2, bb(ii(a))_3
fundamental translation vectors for the crystal lattice
ent
12-3
lattice plane spacingd
distance (iso80000-3) between successive lattice planes
ent
12-6
Burgers vectorbb(ii(b))
closing vector in a sequence of vectors encircling a dislocation
12-7.1
particle position vectorbb(ii(r))
position vector (iso80000-3) of a particle
ent
12-7.2
equilibrium position vector <condensed matter physics>bb(ii(R))_0
position vector (iso80000-3) of an ion or atom in equilibrium
ent
12-7.3
displacement vector <condensed matter physics>bb(ii(u))
difference between the position vector (iso80000-3) of an ion or atom and its position vector in equilibrium
ent
12-15.1
mean free path of phononsl_"p"
average distance (iso80000-3) that phonons travel between two successive interactions
12-15.2
mean free path of electronsl_"e"
average distance (iso80000-3) that electrons travel between two successive interactions
12-17
residual resistivityrho_0
for metals, the resistivity (iec80000-6) extrapolated to zero thermodynamic temperature (iso80000-5)
12-33
diffusion length <condensed matter physics>L
square root of the product of diffusion coefficient (iso80000-10) and lifetime (iso80000-10)
12-38.1
London penetration depthlambda_"L"
distance (iso80000-3) a magnetic field penetrates the plane surface of a semi-finite superconductor according to the…
12-38.2
coherence lengthxi
distance (iso80000-3) in a superconductor over which the effect of a perturbation is appreciable at zero thermodynamic…