In chemical formulas, the letter is generally an o, O (as in H 2O). Ask author if in doubt on whether the character is an o or a 0. Subscript letter o (as in p o) and subscript number zero ( p 0) are differentiated typographically. When two or more equations are designated by the same number the equation number can be placed on the right hand margin below the whole group or, if the equations are short, the number may be placed midway in the margin opposite the equations.ĭistinguishing between Zero (0) and Oh (o) If an equation occupies more than one line, the equation number is aligned with the last line.
The numbers appear in parentheses at the right margin. The alignment of exponents and subscripts may involve a separate operation.įor reference purposes some or all equations may be numbered. In keyboarding, the subscript usually precedes the superscript ( D min2) as this arrangement is relatively simple to set. Follow author’s text on use or omission of a comma in subscripts such as c33, n12, n1,2, nij. When a symbol carries two subscripts, a comma without a space is generally used between them (R1,max). Italics are reserved for mathematical symbols (variable quantities) even though they are, in fact, a kind of abbreviation. Words, chemical formulas, numerals, and abbreviations in subcripts are set in roman characters. Roman is also used for abbreviations (lb, pH, KE, Re, sin, cos) and Greek letters.Ĭonstants in a mathematical equation are set in roman. Chemical symbols and letters indicating shape are set in roman characters (O2, CaCl2, T network, S-shaped). Mathematical symbols (variable quantities) are set in italic characters (A, B, C, a, b, c, x, y, z). In a series, units of measurement are usually omitted for all but the last number, except for percent and degree signs: 22, 30 and 35 cm 20%, 30% and 42% 68° to 70°.
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