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Hyphenation
Use Webster's Instant Word Guide, American Heritage Dictionary, or Webster's Third Edition Unabridged to check word divisions. If a word is not in the dictionary, do hyphenate it if writing it solid would form another word within the word (co-winner, not cowinner) or, for some other reason, it would make it hard to read. For general guidance, follow Table 6.1 in the Chicago Manual of Style, 14th ed., pp. 219–231.
Do hyphenate
modifiers composed of a number and unit: "a five-kilometer hike." But rewrite such expressions as "a 30 X 40 cm aperture."
modifiers involving comparative and superlative forms: better-qualified candidate
Do not hyphenate
modified adjective phrases: short-lived compounds, but very short lived compounds
In a range, if the word "from" is used, the word "to" must also appear: "from 7 to 15 min," not "from 7–15 min." "A period of 7–15 min." is O.K.
Break words that always have hyphens only at the hyphen.
The above are hard-and-fast rules. Below are highly desirable guidelines that should be sacrificed only if the alternative is an ugly layout.
Do not hyphenate more than three lines in a row.
Break compound, unhyphenated words only between the roots: thunder-storm, micro-physical. (However, remember to check Webster's Instant Word Guide first.)
See also "en dash," "numbers," and "line breaks."
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