Title 40

SECTION 60.3

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 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:

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 NOX - nitrogen oxides O2 - oxygen SO2 - sulfur dioxide SO3 - sulfur trioxide SOX - 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]

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