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Is there a hyphen between number and unit?
Editor’s Note: In concentrations, to avoid ambiguity, the number and unit of measure should be hyphenated and of should not be used (eg, 100-nmol/L phorbol 12-myristate 13-acetate, not 100 nmol/L of phorbol 12-myristate 13- acetate (§18.5. 7, Solutions and Concentration, p 796).
How do you write a hyphen in numbers?
You should always hyphenate numbers when you are describing compound numbers between 21 and 99 (except 30, 40, 50, 60, 70, 80 and 90). A compound number is any number that consists of two words; for example, eighty-eight, twenty-two, forty-nine. Numbers higher than 99 do not need a hyphen.
Should 30 day be hyphenated?
With compound adjectives denoting periods of time or amounts, drop the plurals {nine-month pregnancy; 24-hour-a-day service; two-liter bottle}. Note that you would write 30-day notice or 30 days’ notice but not 30-days notice. There is an exception of sorts for fractions: two-thirds majority. Suspensive hyphens.
Do you need a hyphen between number and month?
In the case of “one to two months”, “months” is the head noun and the numbers are quantifying it – they are not adjectives, they are quantifiers. We can use a dash to replace “to” in, for instance, “1–2”, but we don’t use dashes (or hyphens) and “to” with number ranges.
Does 1 hour Need a hyphen?
1 Answer. Because you are making an adjective out of the words one and hour, you should hyphenate. The combination of one and hour modifies the word session.
Is there a hyphen between number and year?
Hyphen With Number of Years Use hyphens when you are using someone’s age as a label. Four-and-a-half-year-olds are not reasonable about nap time. The two-year-old’s favorite food was yogurt. Don’t use hyphens when you’re just talking about a span of time.
Is it 2 hour or 2 hours?
When writing with SI, “2 hours” is always “2h”, and is never “2hr” or “2hrs”. “2 minutes” would similarly be “2min”, rather than “2m” or “2mins”.
Is miles an hour hyphenated?
AP Style tip: The abbreviation mph is acceptable in all references for miles per hour. No hyphen when used with a figure: 60 mph.