Only abbreviate units associated with measure when you'll find numbers preceding all of them or in tables.
Examples:
The tank was 3.5 m in diameter.
The off-road pit was various meters away.
Don't add "s" to abbreviations to make them plural, but do add the "s" if the phrase is spelled out.
Examples:
The pickup truck held 500 bbl involving methanol. (not bbls)
The truck considered 10 tons along 23,489 miles around the odometer.
Don't use symbols like #, ' or " to indicate models.
Use lbm for pounds of mass, lbf for kilos of force, toes for feet, plus in. for inches.
And don't ever use lbs. (Observe rule about plurals above.)
Use cm3 for cubic centimeters, not really cc.
Use a slash ( / ) in place of your message "per."
Example:. 87 psi/ft
For English products, use a hyphen to indicate an item of two devices.
For metric units, make use of a dot to indicate multiplication connected with two units.
(For a dot using Concept software, insert token 00B7 from Unicode (hex) character collection.)
Examples:. ft-lbf,. ohm·m
| Units of Time | English | Metric |
| Second | sec | s |
| Minute | min | min |
| Hour | hr | h |
| Day | D | d |
| Year / Annum | yr | a |
And never leave numbers getting stuck without their items of measure.
Whenever certainly one of his students erred in a manner, my old geometry teacher, Mr. Perrone, used to demand in a thundering voice: "Apples, green beans, or bananas?"
He pronounced the latter "Bah-nah-nahs."
It's still calling in my ears 30+ several years later.