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EU:  METRE

Status: STD 2005/06/07
Code: 142
Symbol: m
EQ label: LENGTH
 
Quantities associated with this Unit

Quantity: object distance
Concept definition: For a centred optical system, distance [ISO 80000-3:2006, item 3-1.9] from a given object to the closest surface of the centred optical system.
 
Reference type: PR
Reference: [ISO 80000-7:2008, item 7-59.a and item 7-59.1]
Supplemental references:  

Quantity: sound particle displacement
Concept definition: Instantaneous displacement of a particle in a medium from what would be its position in the absence of sound waves.
 
Reference type: PR
Reference: [ISO 80000-8:2007, item 8-10.a]
Supplemental references:  

Quantity: mean free path
Concept definition: For a particle, the average distance between two successive collisions with other molecules.
 
Reference type: PR
Reference: [ISO 80000-9:2009, item 9-44.a]
Supplemental references:  

Quantity: half-value thickness
Concept definition: The thickness [ISO 80000-3:2006, item 3-1.4] of the attenuating layer that reduces the quantity of interest of a unidirectional beam to half of its initial value.
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-54.a]
Supplemental references:  

Quantity: length
Concept definition: The length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second.
SI base unit.
 
Reference type: PR
Reference: [ISO 80000-3:2006, 3-1.a]
Supplemental references: [ISO 80000-1:2009, Table 1, "length"]

Quantity: wavelength
Concept definition: The distance in the direction of propagation of a sinusoidal wave between two successive points where at a given instant in time the phase differs by 2π (see [ISO 80000-3:2006, item 3-25, Remarks]).
 
Reference type: PR
Reference: [ISO 80000-3:2006, item 3-17.a]
Supplemental references: [ISO 80000-7:2008, item 7-3.a and item 7-3.2]; [ISO 80000-8:2007, item 8-5.a]

Quantity: Bohr radius
Concept definition: (4π ε0h2)/(mee2 where ε0 is the electric constant [IEC 80000-6:2008, item 6-14.1], h is the reduced Planck constant [IEC 80000-6:2008, item 10-6.2], me is the rest mass of an electron [ISO 80000-10:2009, item 10-2], and e is the elementary charge [ISO 80000-10:2009, item 10-5.1]; 0,529 177 208 5936 x 10-10 metre.
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-7.a]
Supplemental references:  

Quantity: electron radius
Concept definition: -e2/(4π ε0mec02) where e is the elementary charge [ISO 80000-10:2009, item 10-5.1], ε0 is the electric constant [IEC 80000-6:2008, item 6-14.1], me is the rest mass of an electron [ISO 80000-10:2009, item 10-2], and c0 is the speed of light in vacuum [ISO 80000-7:2008, item 7-4.1].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-21.a]
Supplemental references:  

Quantity: Compton wavelength
Concept definition: h/mc0, where h is the Planck constant [ISO 80000-10:2009, item 10-6.1], m is the rest mass [ISO 80000-10:2009, item 10-2] of a particle and c0 is the speed of light in vacuum [ISO 80000-7:2008, item 7-4.1].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-22.a]
Supplemental references:  

Quantity: mean free path of phonons
Concept definition: The mean free path [ISO 80000-10:2009, item 10-73] of phonons.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-16.a and item 12-16.1]
Supplemental references:  

Quantity: diffusion length
Concept definition: The square root of D τ, where D is the diffusion coefficient [ISO 80000-9:2009, item 9-45] and τ is lifetime [ISO 80000-3:2006, item 3-7].
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-34.a]
Supplemental references:  

Quantity: mean linear range
Concept definition: The mean total rectified path length [ISO 80000-3:2006, item 3-1.1] travelled by a particle in the course of slowing down to rest (or to some suitable cut-off energy) in a given substance under specified conditions averaged over a group of particles having the same initial energy [ISO 80000-5:2007, item 5-20.1].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-58.a]
Supplemental references:  

Quantity: nuclear radius
Concept definition: The conventional radius of the sphere in which the nuclear matter is included.
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-19.a]
Supplemental references:  

Quantity: mean free path
Concept definition: The average distance [ISO 80000-3:2006, item 3-1.9] that particles travel between two successive specified reactions or processes.
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-73.a]
Supplemental references:  

Quantity: slowing-down length
Concept definition: The square root of L2, where L2 is the slowing-down area [ISO 80000-10:2009, item 10-74.1].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-75.a and item 10-75.1]
Supplemental references:  

Quantity: diffusion length
Concept definition: The square root of L2, where L2 is the diffusion area [ISO 80000-10:2009, item 10-74.2].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-75.a and item 10-75.2]
Supplemental references:  

Quantity: migration length
Concept definition: The square root of M2, where M2 is the migration area [ISO 80000-10:2009, item 10-74.3].
 
Reference type: PR
Reference: [ISO 80000-10:2009, item 10-75.a and item 10-75.3]
Supplemental references:  

Quantity: lattice vector
Concept definition: The translation vector that maps the crystal lattice on itself.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-1.a and item 12-1.1]
Supplemental references:  

Quantity: fundamental lattice vectors
Concept definition: The fundamental translation vectors for the crystal lattice.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-1.a and item 12-1.2]
Supplemental references:  

Quantity: lattice plane spacing
Concept definition: The distance between successive lattice planes.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-3.a]
Supplemental references:  

Quantity: Burgers vector
Concept definition: The vector characterizing a dislocation, i.e. the closing vector in a Burgers circuit encircling a dislocation line.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-7.a]
Supplemental references:  

Quantity: coherence length
Concept definition: The distance [ISO 80000-3:2006, item 3-1.9] in a superconductor over which the effect of a perturbation is appreciable.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-39.a and item 12-39.2]
Supplemental references:  

Quantity: image distance
Concept definition: For a centred optical system, distance [ISO 80000-3:2006, item 3-1.9] from an image of the given object to the closest surface of the centred optical system.
 
Reference type: PR
Reference: [ISO 80000-7:2008, item 7-59.a and item 7-59.2]
Supplemental references:  

Quantity: object focal distance
Concept definition: For a centred optical system, distance [ISO 80000-3:2006, item 3-1.9] from the focal point at the object side to the closest surface of the centred optical system.
 
Reference type: PR
Reference: [ISO 80000-7:2008, item 7-59.a and item 7-59.3]
Supplemental references:  

Quantity: image focal distance
Concept definition: For a centred optical system, distance [ISO 80000-3:2006, item 3-1.9] from the focal point at the image side to the closest surface of the centred optical system.
 
Reference type: PR
Reference: [ISO 80000-7:2008, item 7-59.a and item 7-59.4]
Supplemental references:  

Quantity: mean free path of electrons
Concept definition: The mean free path [ISO 80000-10:2009, item 10-73] of electrons.
 
Reference type: PR
Reference: [ISO 80000-12:2009, item 12-16.a and item 12-16.2]
Supplemental references:  


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