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Ullmann's Energy:
Resources, Processes, Products

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Preface

This handbook features selected articles from the 7th edition of ULLMANN'S Encyclopedia of Industrial Chemistry, including newly written articles that have not been published in a printed edition before. True to the tradition of the ULLMANN'S Encyclopedia, products and processes are addressed from an industrial perspective, including production figures, quality standards and patent protection issues where appropriate. Safety and environmental aspects which are a key concern for modern process industries are likewise considered.

More content on related topics can be found in the complete edition of the ULLMANN'S Encyclopedia.

About ULLMANN'S

ULLMANN'S Encyclopedia is the world's largest reference in applied chemistry, industrial chemistry, and chemical engineering. In its current edition, the Encyclopedia contains more than 30,000 pages, 15,000 tables, 25,000 figures, and innumerable literature sources and cross-references, offering a wealth of comprehensive and well-structured information on all facets of industrial chemistry.

1,100 major articles cover the following main areas:

First published in 1914 by Professor Fritz Ullmann in Berlin, the Enzyklopädie der Technischen Chemie (as the German title read) quickly became the standard reference work in industrial chemistry. Generations of chemists have since relied on ULLMANN'S as their prime reference source. Three further German editions followed in 1928–1932, 1951–1970, and in 1972–1984. From 1985 to 1996, the 5th edition of ULLMANN'S Encyclopedia of Industrial Chemistry was the first edition to be published in English rather than German language. So far, two more complete English editions have been published; the 6th edition of 40 volumes in 2002, and the 7th edition in 2011, again comprising 40 volumes. In addition, a number of smaller topic-oriented editions have been published.

Since 1997, ULLMANN'S Encyclopedia of Industrial Chemistry has also been available in electronic format, first in a CD-ROM edition and, since 2000, in an enhanced online edition. Both electronic editions feature powerful search and navigation functions as well as regular content updates.

Symbols and Units

Symbols and units agree with SI standards (for conversion factors see page XI). The following list gives the most important symbols used in the encyclopedia. Articles with many specific units and symbols have a similar list as front matter.

Symbol Unit Physical Quantity
aB activity of substance B
Ar relative atomic mass (atomic weight)
A m2 area
cB mol/m3, mol/L (M) concentration of substance B
C C/V electric capacity
cp, cv J kg−1 K−1 specific heat capacity
d cm, m diameter
d relative density (ϱ/ϱwater)
D m2/s diffusion coefficient
D Gy (=J/kg) absorbed dose
e C elementary charge
E J energy
E V/m electric field strength
E V electromotive force
EA J activation energy
f activity coefficient
F C/mol Faraday constant
F N force
g m/s2 acceleration due to gravity
G J Gibbs free energy
h m height
W·s2 Planck constant
H J enthalpy
I A electric current
I cd luminous intensity
k (variable) rate constant of a chemical reaction
k J/K Boltzmann constant
K (variable) equilibrium constant
l m length
m g, kg, t mass
Mr relative molecular mass (molecular weight)
img refractive index (sodium D-line, 20 °C)
n mol amount of substance
NA mol−1 Avogadro constant (6.023 × 1023 mol−1)
P Pa, bar* pressure
Q J quantity of heat
r m radius
R JK−1 mol−1 gas constant
R Ω electric resistance
S J/K entropy
t s, min, h, d, month, a time
t °C temperature
T K absolute temperature
u m/s velocity
U V electric potential
U J internal energy
V m3, L, mL, µL volume
w mass fraction
W J work
xB mole fraction of substance B
Z proton number, atomic number
α cubic expansion coefficient
α Wm−2K−1 heat-transfer coefficient (heat-transfer number)
α degree of dissociation of electrolyte
[α] 10−2deg cm2g−1 specific rotation
η Pa·s dynamic viscosity
θ °C temperature
ϰ cp/cv
λ Wm−1K−1 thermal conductivity
λ nm, m wavelength
µ chemical potential
ν Hz, s−1 frequency
ν m2/s kinematic viscosity (η/ϱ)
π Pa osmotic pressure
ϱ g/cm3 density
σ N/m surface tension
τ Pa (N/m2) shear stress
φ volume fraction
χ Pa−1 (m2/N) compressibility
*The official unit of pressure is the pascal (Pa).

Conversion Factors

SI unit Non-SI unit From SI to non-SI multiply by
Mass
kg pound (avoirdupois) 2.205
kg ton (long) 9.842 × 10−4
kg ton (short) 1.102 × 10−3
Volume
m3 cubic inch 6.102 × 104
m3 cubic foot 35.315
m3 gallon (U.S., liquid) 2.642 × 102
m3 gallon (Imperial) 2.200 × 102
Temperature
°C °F °C × l.8 + 32
Force
N dyne 1.0 × 105
Energy, Work
J Btu (int.) 9.480 × 10−4
J cal (int.) 2.389 × 10−1
J eV 6.242 × 1018
J erg 1.0 × 107
J kW·h 2.778 × 10−7
J kp·m 1.020 × 10−1
Pressure
MPa at 10.20
MPa atm 9.869
MPa bar 10
kPa mbar 10
kPa mm Hg 7.502
kPa psi 0.145
kPa torr 7.502

Powers of Ten

E (exa) 1018 d (deci) 10−1
P (peta) 1015 c (centi) 10−2
T (tera) 1012 m (milli) 10−3
G (giga) 109 µ (micro) 10−6
M (mega) 106 n (nano) 10−9
k (kilo) 103 p (pico) 10−12
h (hecto) 102 f (femto) 10−15
da (deca) 10 a (atto) 10−18