Code of Federal Regulations Title 40. Protection of Environment § 40.61.03 Units and abbreviations

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

A=ampere

g=gram

Hz=hertz

J=joule

K=degree Kelvin

kg=kilogram

m=meter

m² = square meter

m ³ =cubic meter

mg=milligram=10 ⁻³ gram

mm=millimeter=10 ⁻³ meter

Mg=megagram=10 ⁶ 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:

°C=degree Celsius (centigrade)

cfm=cubic feet per minute

cc=cubic centimeter

Ci=curie

d=day

°F=degree Fahrenheit

ft ² =square feet

ft ³ =cubic feet

gal=gallon

in=inch

in Hg=inches of mercury

in H₂O=inches of water

l=liter

lb=pound

lpm=liter per minute

min=minute

ml=milliliter=10 ⁻³ liter

mrem=millirem=10⁻³ rem

oz=ounces

pCi=picocurie=10⁻¹² curie

psig=pounds per square inch gage

°R=degree Rankine

μl=microliter=10 ⁻⁶ liter

v/v=volume per volume

yd ² =square yards

yr=year

(c) Chemical nomenclature:

Be=beryllium

Hg=mercury

H₂O=water

(d) Miscellaneous: