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; Fundamental units are defined in terms of five fundamental physical
; constants, expressed in AI units.  From the CRC Handbook,
; pp. F189-F190:
;
;   c : The vacuum speed of light
;         2.9979250E+08 m/sec
;
;   e : Electron charge
;         1.6021917E-19 C (coulombs)
;
;   h : The Planck Constant
;         6.626196E-34  kg-m^2/sec
;
;   k : The Boltzmann Constant
;         1.380622E-23 kg-m^2/sec^2-K (K=degrees kelvin)
;
;   m : Electron rest mass (kg)
;         9.109558E-31 kg
;
; A line defining a unit in fundamental form has the form
;
;   x1,x2,x3,x4,x5,f,a
;
; The "x" terms are (integer) exponents of the five fundamental
; constants; "f" is a factor; "a" is an additive term (used only in
; temperature).  They define a value as follows (where ^ denotes
; exponentiation and * multiplication):  If we have U of the units
; being defined, the AI equivalent is
;
;   (c^x1 * e^x2 * h^x3 * k^x4 * m^x5) * (U*f + a)
;
; Notice that the factor composed of the fundamental constants defines
; a "fundamental unit" that is some multiple of the corresponding
; AI unit.  If we have U of the units we're defining, we therefore
; have U*f+a "fundamental units".  To convert this to some other unit,
; we seek U', where U'*f'+a' = U*f+a, or
;
;   U' = (U*f+a-a')/f'
;
; For all but temperature, a and a' are zero reducing this to
;
;   U' = U*f/f'
;
; Because of the way we're combining the fundamental constants to
; produce a specific type of unit via dimensional analysis (length,
; mass, speed, etc.), all fundamental definitions of the same type have
; the same set of exponents (x1-x5).  Here are the formats of some of
; the basic types (along with their "fundamental units" in AI units,
; using the CRC values):