The second edition of "Formulas, Facts and Constants" has been enlarged without undue increase in volume. The constants have been revised to 1986 values. Prom ted by comments of many readers a section on error analysis has been added. host impor tantly, the new edition now has a subject index in addition to the detailed Table of Contents. The basic format has not been changed and the aim of the book remains to be a handy source of formulas, conversion factors and constants for everyday use. Fundamental tools of mathematics needed in all areas of the physical sciences are given in Section 1....