Table B2. Metric Prefixes Unit Multiple Prefix …

Table B2. Metric Prefixes
Unit Multiple          Prefix                Symbol                 Unit Subdivision          Prefix                 Symbol
       101             deka                     da                       10-1                  deci                     d
         2                                                                    -2
       10              hecto                    h                        10                    centi                    c
       103             kilo                     k                        10-3                  milli                    m
       106             mega                     M                        10-6                  micro                    µ
       109             giga                     G                        10-9                  nano                     n
       1012            tera                     T                        10-12                 pico                     p
       1015            peta                     P                        10-15                 femto                    f
         18
       10              exa                      E                        10-18                 atto                     a
         21                                                                   -21
       10              zetta                    Z                        10                    zepto                    z
       1024            yotta                    Y                        10-24                 yocto                    y


  Web Page: For related information, see http://www.eia.doe.gov/emeu/aer/append_b.html.
  Source: U.S. Department of Commerce, National Institute of Standards and Technology, The International System of Units (SI), NIST
Special Publication 330, 1991 Edition (Washington, DC, August 1991), p.10.


Table B3. Other Physical Conversion Factors
Energy Source        Original Unit                                                    Equiv alent in Final Units

Petroleum            1 barrel (bbl)                             =                      42a      U.S. gallons (gal)

Coal                 1 short ton                                =                   2,000a      pounds (lb)
                     1 long ton                                 =                   2,240a      pounds (lb)
                     1 metric ton (t)                           =                   1,000a      kilograms (kg)

Wood                 1 cord (cd)                                =                    1.25b      shorts tons
                     1 cord (cd)                                =                     128a      cubic feet (ft3)

  a
    Exact conversion.
  b
    Calculated by the Energy Information Administration.
    Web Page: For related information, see http://www.eia.doe.gov/emeu/aer/append_b.html.
   Source: U.S. Department of Commerce, National Institute of Standards and Technology, Specifications, Tolerances, and Other Techni-
cal Requirements for Weighing and Measuring Devices, NIST Handbook 44, 1994 Edition (Washington, DC, October 1993), pp. B-10, C-17
and C-21.




                                                         Energy Information Administration / Annual Energy Review 2007                  373