APPENDIXC SYMBOLS FORPHYSICALQUANTITIES 474
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Symbol Physical quantity SI unit
wel electrical work J
w^0 nonexpansion work J
x mole fraction in a phase (dimensionless)
Cartesian space coordinate m
y mole fraction in gas phase (dimensionless)
Cartesian space coordinate m
Z compression factor (compressibility factor) (dimensionless)
z mole fraction in multiphase system (dimensionless)
charge number of an ion (dimensionless)
electron number of cell reaction (dimensionless)
Cartesian space coordinate m
Greek letters
alpha
degree of reaction, dissociation, etc. (dimensionless)
cubic expansion coefficient K ^1
gamma
surface tension N m ^1 , J m ^2
(^) i activity coefficient of speciesi,
pure liquid or solid standard state (dimensionless)
(^) m;i activity coefficient of speciesi,
molality basis (dimensionless)
(^) c;i activity coefficient of speciesi,
concentration basis (dimensionless)
(^) x;i activity coefficient of speciesi,
mole fraction basis (dimensionless)
(^) mean ionic activity coefficient (dimensionless)
pressure factor (activity of a reference state) (dimensionless)
epsilon
efficiency of a heat engine (dimensionless)
energy equivalent of a calorimeter J K ^1
theta
angle of rotation (dimensionless)
kappa
reciprocal radius of ionic atmosphere m ^1
T isothermal compressibility Pa ^1
mu
chemical potential J mol ^1
JT Joule–Thomson coefficient K Pa ^1
nu
number of ions per formula unit (dimensionless)