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Joule—Capitalize when not the unit: Joule effect, Joule's law, but 13 joules.

journal titles—Use italics in all cases, including for news releases (deviation from AP style, since we frequently deal with journal/article distinctions). According to a new study in Nature, ..... This exception follows Chicago's rules, so also use italics for book and magazine titles, movies, TV series, and any other work works for which Chicago specifies italics.

Jr. or Sr.—do not precede by a comma: John Johnson Jr. will be speaking on . . . . Same for roman numerals: John Johnson III. In a format where names are in all caps the "r" is still lower case: J.J. JOHNSON Jr.


K—suffix meaning 1,000. Acceptable in computing context, for tables, and — as long as the meaning is made clear — in internal communication; also the symbol for planetary wave number. Also the abbreviation for Kelvin (see below).

Kármán—Always include both accents

Kelvin scale—Do not use the word or symbol for degree: 280 K. First-use spellout for nontechnical articles is lowercase: 280 kelvins (more than 1 is always plural).

knots—nautical miles per hour: always convert to mph (or to km/h for metric). Conversions: 1 knot = 1.15 mph; 1 knot = 1.85 km/h.

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