§ 60.3 - Units and abbreviations.

§ 60.3 Units and abbreviations.

Used in this part are abbreviations and symbols of units of measure. These are defined as follows:

(a) System International (SI) units of measure:

A - ampere

g - gram

Hz - hertz

J - joule

K - degree Kelvin

kg - kilogram

m - meter

m³ - cubic meter

mg - milligram - 10⁻³ gram

mm - millimeter - 10⁻³ meter

Mg - megagram - 10⁶ gram

mol - mole

N - newton

ng - nanogram - 10⁻⁹ gram

nm - nanometer - 10⁻⁹ meter

Pa - pascal

s - second

V - volt

W - watt

Ω - ohm

µg - microgram - 10⁻⁶ gram

(b) Other units of measure:

Btu - British thermal unit

°C - degree Celsius (centigrade)

cal - calorie

cfm - cubic feet per minute

cu ft - cubic feet

dcf - dry cubic feet

dcm - dry cubic meter

dscf - dry cubic feet at standard conditions

dscm - dry cubic meter at standard conditions

eq - equivalent

°F - degree Fahrenheit

ft - feet

gal - gallon

gr - grain

g-eq - gram equivalent

hr - hour

in - inch

k - 1,000

l - liter

lpm - liter per minute

lb - pound

meq - milliequivalent

min - minute

ml - milliliter

mol. wt. - molecular weight

ppb - parts per billion

ppm - parts per million

psia - pounds per square inch absolute

psig - pounds per square inch gage

°R - degree Rankine

scf - cubic feet at standard conditions

scfh - cubic feet per hour at standard conditions

scm - cubic meter at standard conditions

sec - second

sq ft - square feet

std - at standard conditions

(c) Chemical nomenclature:

CdS - cadmium sulfide

CO - carbon monoxide

CO₂ - carbon dioxide

HCl - hydrochloric acid

Hg - mercury

H₂O - water

H₂S - hydrogen sulfide

H₂SO₄ - sulfuric acid

N₂ - nitrogen

NO - nitric oxide

NO₂ - nitrogen dioxide

NO_X - nitrogen oxides

O₂ - oxygen

SO₂ - sulfur dioxide

SO₃ - sulfur trioxide

SO_X - sulfur oxides

(d) Miscellaneous:

A.S.T.M. - American Society for Testing and Materials

[42 FR 37000, July 19, 1977; 42 FR 38178, July 27, 1977]