| UM | DESCRIPTION | COMMENTS |
|---|
| % | PERCENT | |
| AMPS | AMPERES | |
| ATM | ATMOSPHERE | 1 ATM = 33.9 FTWC = 14.7 PSI = 29.92 INHG |
| BHP | BRAKE HORSEPOWER | |
| BTU | BRITISH THERMAL UNIT | |
| BTUH | BTU PER HOUR | 1 TON OF REFRIGERATION = 12,000 BTUH |
| BTUM | BTU PER MINUTE | |
| C | DEGREES CELSIUS | |
| CC | CUBIC CENTIMETERS | |
| CF | CUBIC FEET | |
| CFM | CUBIC FT PER MINUTE | |
| CI | CUBIC INCHES | |
| CM | CENTIMETERS | |
| DATE | NUM DATE YYMMDD | EXAMPLE: 020821 IS AUG 21, 2002 |
| DAYS | NUMBER OF DAYS | |
| DB | DECIBELS | |
| DEG F | DEGREES FAHRENHEIT | |
| FLAG | 0=NO/OFF 1=YES/ON | 0 MEANS NO OR OFF, 1 MEANS YES OR ON |
| FLOZ | FLUID OUNCES | |
| FPM | FEET PER MINUTE | |
| FPS | FEET PER SECOND | |
| FT | FEET | |
| FTLB | FOOT POUNDS | |
| FTWC | FEET OF H2O COLUMN | |
| FTWG | FEET OF H20 GAUGE | ATMOSPHERIC PRESSURE |
| GAL | GALLONS | |
| GPM | GALLONS PER MINUTE | |
| GR | GRAINS | 1 POUND = 7000 GRAINS |
| HOURS | NUMBER OF HOURS | |
| HP | HORSEPOWER | 1 HP = 2,545 BTUH = 746 W |
| HZ | HERTZ | SAME AS CYCLES PER SECOND |
| IN. | INCHES | |
| INHG | IN OF MERCURY GAUGE | 1 INHG = 1.13 FTWG = .4391 PSI = .03945 MMHG |
| INWC | INCHES OF H2O COLUMN | |
| INWG | INCHES OF H20 GAUGE | ATMOSPHERIC PRESSURE |
| K | DEGREES KELVIN | DEG K = DEG C + 273 |
| KG | KILOGRAMS | |
| KV | KILOVOLTS | |
| KVA | KILO VOLT-AMPS | |
| KW | KILOWATT | |
| KWH | KILOWATT-HOUR | |
| LBCF | LBS PER CUBIC FOOT | MEASURE OF DENSITY |
| LBHR | LBS PER HOUR | |
| LBMIN | LBS PER MINUTE | |
| LBS | POUNDS | |
| LBSEC | LBS PER SECOND | |
| METER | METERS | |
| MILES | MILES | |
| MIN | NUMBER OF MINUTES | |
| MM | MILLIMETERS | |
| MONTH | NUMBER OF MONTHS | |
| OHM | RESISTANCE - OHMS | |
| OZ | OUNCES | |
| PF | POWER FACTOR | |
| PH | ACIDITY | |
| PINT | PINTS | |
| POO | % OF OBSCURATION | |
| PPM | PARTS PER MILLION | |
| PSF | POUNDS PER SQ FT | |
| PSI | POUNDS PER SQ INCH | |
| PSIA | LBS/SQ FT ABSOLUTE | 1 PSIG = 14.7 PSIA AT SEA LEVEL |
| PSIG | LBS/SQ INCH GAUGE | |
| QT | QUARTS | |
| R | DEGREES RANKIN | DEG R = DEG F + 460 |
| SEC | NUMBER OF SECONDS | |
| SF | SQUARE FEET | |
| VA | VOLT-AMPS | |
| VAC | VOLTS ALT CURRENT | |
| VDC | VOLTS DIRECT CURRENT | |
| VOLTS | VOLTS | |
| W | WATT | 1 WATT = 3.41 BTUH = .00134 HP |
| WH | WATT-HOURS | |
| YARDS | YARDS | |
| YEARS | NUMBER OF YEARS | |