Geoscience Reference
In-Depth Information
Table A6.1 (
cont.
)
First
Symbol
Name
Units
equation
M
S
Surface-wave magnitude
(4.14)
M
w
Moment magnitude
(4.21)
N
Number
(4.24)
N
Number of parent atoms
(6.1)
cm
−2
n
Neutron dose
(6.58)
N
I
Number of induced fission
tracks
(6.59)
N
S
Number of spontaneous
fissions
(6.59)
Nu
Nusselt number
(8.34)
Nm
−2
P
Pressure
Pa
=
(4.30)
s degree
−1
p
Seismic ray parameter
(A3.7)
Pe
t
Peclet number
(8.36)
Q
Konigsberger ratio
Q
Quality factor
(8.21)
Wm
−2
Q
Rate of flow of heat per unit
area
(7.2)
R
Radius of the Earth
m
(2.3)
J mol
−1 ◦
C
−1
R
Gas constant
(6.24)
r
Radius
m
(3.1)
r
Depth of root
m
(5.23)
Ra
Rayleigh number
(8.31)
Re
Reynolds number
(8.33)
R
e
Equatorial radius of the
Earth
m
(5.17)
S
Entropy
J kg
−1 ◦
C
−1
(7.86)
T
Temperature
◦
C, K
(6.24)
T
Age of the Earth
(6.61)
T
Period
s
(4.13)
t
Time
s
(4.1)
t
Thickness
m
(5.31)
◦
C
T
p
Potential temperature
(7.95)
T
1
/
2
Half-life
(6.7)
TTI
Time-temperature index
(10.27)
km s
−1
U
Group velocity
(4.7)
u
Displacement
m
(4.3)
m s
−1
u
Velocity
(7.18)
V
Magnetic potential
A (amp)
(3.1)
km s
−1
V
Phase velocity
(4.7)
V
Volume
m
3
(4.36)
V
Gravitational potential
m
2
s
−2
(5.2)
(
cont.
)
