Which is the correct abbreviation for hours: 2h, 2 h, 2hs, 2 hs, 2hrs or 2 hrs?

We ask a multiple choice question every Tuesday on the rules of scientific writing and formatting.

We will post every question on twitter (@ScienceExperts), our Facebook wall and here in our blog.  Test yourself and find out how much you know.   It’s just for fun and maybe you’ll learn something new!  The answer is provided below the question in the blog post.

We were very busy last week and unfortunately didn’t have time to post a new question, but here’s this week’s question.

18th Oct 2011

Which is the correct abbreviation for hours: 2h, 2 h, 2hs, 2 hs, 2hrs or 2 hrs?

Photo credit: Steven Gresser on Flickr

Answer: 2 h.

This question follows a lot of the same rules as the last question on the correct use of ml.

The correct abbrevation for hours is h. Units should always be written in the singular form, for example h,  cm or mM (not hs, cms or mMs).  This rule always applies, even if you are talking about 1, 12 or 96 hours.

There should always be a space between the number and unit:  for example 2 µM, 3 cm and 5 ml (not 2µM, 3cm and 5ml). It’s easy to remember this rule if you imagine the text without abbreviations, because you would never write 2microliters, 3centimeters or 5milliliters.

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See you next Tuesday for another question!

The Science Editing Experts Team

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