BME 21001, Fall 2011
Important Quantities to be known by memory for Exam 1
Dimensions expressed as
L
= Length,
M
= mass,
T
= time,
Ө
= temperature,
N
= Moles,
W
= Molecular Weigh,
V
= voltage,
A
=Amperes.
Q
= Charge
A =
Cross sectional area perpendicular to flux,[
L
2
]
c
= Total molar concentration of a material, [
M/(W L
3
) or
N/L
3
]
C
A
= Concentration of substance A
in a multicomponent material, [
M/(W L
3
) or
N/L
3
]
c
p
=
Heat capacity, [
L
2
/(T
2

)
Ө
]
,
D
AB
= Diffusion coefficient (diffusivity) of A in B, [
L
2
/T
]
ΔE = Electrical potential difference, [
M/(L
2
T
3
Q)
]
f=
Friction factor, dimensionless.
Fick’s Law of Diffusion
Fourier’s Law of heat conduction
h = Heat transfer coefficient, [
M/(T
3

Ө
)]
j
i
= mass flux of i relative to mass average velocity, [
M/(L
2
T)
]
j*
i
= mass flux of i relative to molar average velocity,[
M/(L
2
T)
]
J
i
*
= molar flux of i relative to molar average velocity, [
M/(L
2
TW
)]
J
i
*
= C
i
( v
i
– v
i
*
)
J
i
= molar flux of i relative to mass average velocity,[
M/(L
2
TW)
]
k = Thermal Conductivity, [
ML/(T
3
)
Ө
]
k
A
=
Overall mass transfer coefficient, [
L/T
].