Standards for units and values

Subject: Standards for units and values
From: "Hauglie, Joe" <jhauglie -at- ti -dot- com>
To: <techwr-l -at- lists -dot- techwr-l -dot- com>
Date: Mon, 4 Jun 2007 12:46:28 -0500

Hi, everyone. I've got a thorny (and emotionally charged) question to ask. Here's the issue:

What are the acceptable standards for writing numbers and units? In abbreviating units, for example V for volts, do the standards support using a space before the unit or not?

with space
36 V
24.5 pF

without space

To follow on, if the standards support using a space, do they also support using a hyphen when using the number/unit as an adjective or descriptive phrase, or not?

36-V reference
36 V reference

24.5-pF capacitor
24.5 pF capacitor

Most importantly, I need to have a published reference that supports your usage position.

Many thanks -


Joe Hauglie
Technical Editor
Texas Instruments

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