# 40 CFR § 72.3: Measurements, abbreviations, and acronyms

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-40-72.3

## Section

- **Citation:** 40 CFR § 72.3
- **Heading:** Measurements, abbreviations, and acronyms
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 40—Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS > PART 72—PERMITS REGULATION > Subpart A—Acid Rain Program General Provisions

## Text

Measurements, abbreviations, and acronyms used in this part are defined as follows:
acfh—actual cubic feet per hour.
atm—atmosphere.
bbl—barrel.
Btu—British thermal unit.
°C—degree Celsius (centigrade).
CEMS—continuous emission monitoring system.
cfm—cubic feet per minute.
cm—centimeter.
dcf—dry cubic feet.
DOE—Department of Energy.
dscf—dry cubic feet at standard conditions.
dscfh—dry cubic feet per hour at standard conditions.
EIA—Energy Information Administration.
eq—equivalent.
°F—degree Fahrenheit.
fps—feet per second.
gal—gallon.
hr—hour.
in—inch.
°K—degree Kelvin.
kacfm—thousands of cubic feet per minute at actual conditions.
kscfh—thousands of cubic feet per hour at standard conditions.
Kwh—kilowatt hour.
lb—pounds.
m—meter.
mmBtu—million Btu.
min—minute.
mol. wt.—molecular weight.
MWe—megawatt electrical.
MWge—gross megawatt electrical.
NIST—National Institute of Standards and Technology.
ppm—parts per million.
psi—pounds per square inch.
°R—degree Rankine.
RATA—relative accuracy test audit.
scf—cubic feet at standard conditions.
scfh—cubic feet per hour at standard conditions.
sec—second.
std—at standard conditions.
CO2—carbon dioxide.
NOX—nitrogen oxides.
O2—oxygen.
THC—total hydrocarbon content.
SO2—sulfur dioxide.
[58 FR 3650, Jan. 11, 1993, as amended at 64 FR 28588, May 26, 1999]

## Nearby sections

- [40 CFR § 72.1 § 72.1 Purpose and scope.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.1.md)
- [40 CFR § 72.2 § 72.2 Definitions.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.2.md)
- [40 CFR § 72.3 § 72.3 Measurements, abbreviations, and acronyms.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.3.md)
- [40 CFR § 72.4 § 72.4 Federal authority.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.4.md)
- [40 CFR § 72.5 § 72.5 State authority.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.5.md)
- [40 CFR § 72.6 § 72.6 Applicability.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.6.md)
- [40 CFR § 72.7 § 72.7 New units exemption.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.7.md)
- [40 CFR § 72.8 § 72.8 Retired units exemption.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.8.md)
- [40 CFR § 72.9 § 72.9 Standard requirements.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.9.md)
- [40 CFR § 72.10 § 72.10 Availability of information.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.10.md)
- [40 CFR § 72.11 § 72.11 Computation of time.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.11.md)
- [40 CFR § 72.12 § 72.12 Administrative appeals.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.12.md)
- [40 CFR § 72.13 § 72.13 Incorporation by reference.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.13.md)
- [40 CFR § 72.20 § 72.20 Authorization and responsibilities of the designated representative.](https://www.frixlaw.com/law-library/statutes/ecfr-40-72.20.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-40-72.3. Check the current official text before relying on it. Not legal advice.