Geology Reference
In-Depth Information
APPENDIX D: syMBols, uNIts,
coNstANts AND ABBrEvIAtIoNs
usED IN thIs Topic
The units given below are SI units (see below and
http://physics.nist.gov/cuu/Units/). Some older pub-
lications may give the same quantities in traditional
units (e.g. pressure in kbar); for on-line conversion
to SI, visit http://www.megaconverter.com/Mega2/
index.html. Greek and other specialized symbols are
listed separately lower down.
Items in
italics
are symbols used as names of
variables.
A
C
number of
components
in a system at equilibrium
(
Phase Rule
)*
dm
3
cubic decimetre, an
SI
measure of volume
equal to one litre.
D
i
diffusion coefficient for component
i
E
a
activation energy of a chemical reaction
E
k
kinetic energy
E
p
potential energy
Eh
redox/oxidation potential
F
force
atomic
mass number
of an isotope =
Z
+
N
f
number of degrees of freedom (variance)
associated with an equilibrium (
Phase Rule
)*
A
n
amplitude of (
n
− 1
)
th harmonic (Equation 5.1)
An
65
symbol representing a plagioclase solid solu-
tion consisting of 65 mol.% of the anorthite
(CaAl
2
Si
2
O
8
) end-member and 35 mol.% of
albite (NaAlSi
3
O
8
)
f
i
flux of component
i
through unit area per unit
time (mol m
−2
s
−1
)
Fo
90
symbol representing an olivine solid solution
consisting of 90 mol.% of forsterite (Mg
2
SiO
4
)
and 10 mol.% of fayalite (Fe
2
SiO
4
)
BP
before present (when stating age)
c
speed of light (=2.998 × 10
8
m s
−1
in vacuo
)
g
acceleration due to gravity (=9.81 m s
−2
)
c
i
concentration of
component
i
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