Page 496 - Chemical process engineering design and economics

474 Appendix

Examples of SI Derived Units Name Symbol Value in SI Units
Expressed by Means of minute...............' ................1'- (1/60)' =
Special Names (wf10800)rad
second ..............."................1" = (1/60)' =
_________81 Unit ___ (T/648000) rad
Quantity Name Symbol liter..................L ...............1 L - 1dm - I0" m s
3
3
ton ...................t ............... .1 t - 10 kg
3
dynamic
viscosity ..............pascal-second.............Pa • s nautical mile ..........................1 nautical mile - 1852 m
knot...................................1 nautical mile per hour «
(1852/3600)m/H
force ..................meter-newton.............N • m
I0
surface tension ..........newton per angstrom .............A ...............1 A - 0.1 nm - 10~ m
2
1
2
meter...............,._.N/m are ...................a................1 a = 1 dam - 10 m
1
heat flux hectare...............ha...............l ha = 1 hm - 10*m 2
2
density. barn..................b................lb= 100fm = lO'^m 2
irradiance.............watt per square bar................... bar.............. 1 bar- O.I MPa = 10 Pi
s
standard
heat capacity, atmosphere ........atm .............1 atm = 101325 Pa
entnipy ...............joule per kelvin ........... «J/K gal ...................Gal .............1 Gal - 1 cm/s* -
specific heat HT m/ B a
a
capacity, 1
specific curie.................Ci...............ICi- 3.7 x Ifl'V
4
entropy ...............joule per fcilo- rontgen............,..R ...............1H- 2.58 x 10~ C/kg
2
gram-kelvin............J/{kg-K) rad...................rad..............1 rad - I0~ J/kg
specific energy ..........joule per kilogram .........J/kg
thermal
mil per meter-
sity ......... . .joule per cubic Note: In addition to the thernwdynamit: temperature
meter.. ....... ..........J/m (symbol T), expressed in keluins, use is also made of
electric lield Celsius temperature (symbol t) defined by the
strength.. .......... ...volt per meter... .. V/rn equation
electric charge t = T - TO
density ............... .coulomb per
cubic meter. .... ..... . .C/'m a where T 0 = 273.15 K by definition. The Celsius
is
degrees
Ceivius
in
expressed
electric Hux temperature Theunit "degree Celsius" is thus equal
(symbol'C).
density ............... .coulomb per to the unit "kelvin," and an interval or a difference
square meter .......... .C/m* of Celsius temperature may also be expressed in
permittivity ..... ........farad per meter.. ......... F/m degrees Celsius.
permeability ........... .henry per meter ........ ..H/m
molar energy ......... ...joule per mole ....... ......I/mol SI Prefixes
raular entropy, Factor Prefix Symbol Factor Prefix Symbol
molar heat
capacity ............. .joule per mole- 10 18 .....exa........E 10~* ....dec!........d
10 15 .....peta .......P HTjJ ....centi .......c
radiant intensity ..... ...watt persteradian ........ Vf/sr 10 ia .....tera........T
radiance. ............... .watt per square 10 s .....giga........G 10-* ....micro ......;,
2
meter-steradian .... . ...W • m~ -sr" 1 10 6 .....mega ......M
10 3 .... .kilo ....... .k 10~ 12 ....pico........p
10 2 .....hecto ......h 10~ 1S ....femto ......f
10 1 .... .deka ...... .da 10~ 18 ....atto ........a
Units in Use Directions for Use
With the International System SI from symbols are not capitalized unless H. the R. unit is derived
Hertz.
Unab-
name; e.g., MX for
proper
a
Na Symbol Valu breviated units are not capitalized; e.g., hertz, neivton.
kelvin. Only E, P, T, G, and M prefixes are capitalized.
minute ...............min .............1 min = 60 s Except at theend of a sentence, SI units are not to be fal-
hour................. ,h................1 h - 60 min - 3600 s lowed by periods.
With derived
day...................d................1 d =» 24 h =. 86400 a multiplication unit abbreviations, use center dot to denote
newtan-
e.g.,
slash
for
and
division;
a
year..................yr...............1 yr «= 365 d second/meter* = N-s/m . 2
0
degree................ ................1' - (*/180)rad
Conversion Factors to SI for Selected Quantities
* An asterisk after the seventh decimal place indicates the conversion factor is exact and all subsequent digits are zero.
To convert from To^ Multiply by
3
barrel (for petroleum,42gal).............................meter*(m ) ....................................1.5898729 E - 01
British thermal unit
(Btu, International Table).............................joule (J) ............................. ..1.0550559 E +
Cuntinued
CEP August 1977
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