EU: DEGREE_ARC
Status:
STD 2005/06/07
Code:
40
Symbol:
°
EQ label:
PLANE_ANGLE
Quantities associated with this Unit
Quantity:
angle (plane angle)
Concept definition:
s
/
r
, where
s
is the length of the included arc of a circle between two radii of the circle [
ISO 80000-3:2006
, item 3-1.8] and
r
is the radius of the circle [
ISO 80000-3:2006
, item 3-1.5].
1° = (π / 180)
rad
(exactly).
Reference type:
PR
Reference:
[
ISO 80000-3:2006
, item 3-5.b]
Supplemental references:
[
ISO 80000-1:2009
, Table 5, "plane angle"]
Quantity:
Bragg angle
Concept definition:
The angle θ, where 2
d
sin θ =
n
λ,
d
is the lattice plane spacing [
ISO 80000-12:2009
, item 12-3], λ is the wavelength [
ISO 80000-7:2008
, item 7-3] of the radiation, and
n
is an integer.
Reference type:
PR
Reference:
[
ISO 80000-12:2009
, item 12-4.b]
Supplemental references:
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