Dr. Steve
Rapp, 2005

Rules for Writing SI Units

•11. A solidus
(oblique stroke,/), a horizontal line,
or negative exponents may be use to express
a derived unit formed from others by division.

•12. The
solidus must not be repeated on the same
line unless ambiguity can be avoided by parentheses.

•13. When using
the solidus notation, multiple symbols
in the denominator must be enclosed in
parentheses. Example: m.kg/(s3.A).