Separated by a blank line above and below the equation.The following guidelines represent typical formatting considerations a discipline-specific style guide for should be consulted for rules specific to one’s major or organization. Spell out the unit when using it in a non-numerical context all units have a lower-case first letter when written out (even if they are named for a person).Ī tesla is a unit of measurement of the strength of a magnetic field.Įquations are part of the text in a technical document and should not be referred to as figures. The 25- µm beam provides optimal resolution. Place a hyphen between the number and the unit of measure when they modify a noun.Write secondary units in parentheses after the primary units.The strength of an average solar sunspot is equal to 0.3 T. NOTE: Some exceptions include ☌, ☏, K, L). If the unit of measurement is named for a person, the unit is capitalized.Symbols for units are written in the singular form.The heat transfer surface of the cylinder was covered with 25 mm of insulation.Ī single lightning bolt contains over a billion watts. The period is often included after the abbreviation for ínch (in.) to differentiate from the preposition in. If the number is an approximation, spell out the unit. A space is usually placed between a number and a unit of measure. If an exact number is followed by a unit of measurement, abbreviate the unit.The solution was divided into four 250-mL flasks. Note: A modern and consistent approach is to retain the number that goes with the unit and spell out the other number. With two adjacent numbers, the first number is typically spelled out unless the second number is shorter when spelled out.Hyphenate compound numbers 21 through 99 when written as words.Correct: Twenty-five engineers were involved in the project. Incorrect: 25 engineers were involved in the project. Avoid starting sentences with numbers either spell out the number or if the number is tedious, revise the sentence.Approximately 8 samples in 20 had to be discarded.About 50,000 discrete events were recorded.It will take between 9 and 12 months to finish the project.Īpproximate numbers follow the same rules as exact numbers. The collision damaged seven vehicles and injured four passengers. Numerals are used when a number >10 appears in a range or list with higher numbers. Spell out single-digit numbers zero through nine.Consult a discipline-specific style guide for information on expressing numbers and units. NOTE: While the guidelines presented below generally apply to number expression in engineering, different disciplines may have different rules. In order to reflect the precision of the data, numbers must be presented in a way that ensures reader accuracy. Technical documents often contain quantitative measurements.
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