CODATA recommended values of physical constants.
All CODATA recommended values are defined as a constant and as a
function. The function returns three values, the value of the
constant, the standard uncertainty, and the relative standard
uncertainty. Floating-point numbers are of the type `long-float'.
Please note that some of the constants have values which can not be
represented as IEEE 754 single precision floating-point numbers.
(defun E (m)
(symbol-macrolet ((c codata-recommended-values:speed-of-light-in-vacuum))
(* m c c)))
The latest values are available via the `codata-recommended-values'
package. If you need a previously issued value, append the year to
the package name, for example, `codata-recommended-values-2010'.