# Weapons of Mass Destruction (WMD)

## APPENDIX B Units of Measure

This appendix lists the units of measure and their abbreviations commonly used in meteorology. It also contains factors for converting from one unit of measure to another.

### Temperature

Unit of Measure Abbreviation Conversion Formulas
Degrees Fahrenheit
Degrees Celsius
(Formerly referred to
oF
oC
9/5 (oC) + 32 = 1.8 (oC) + 32
5/9 (oF - 32) = .556 (oF - 32)

### Length

Metric Abbreviation US Equivalent
kilometer
meter
centimeter
millimeter
statute mile
nautical mile
yard
foot
inch
km
m
cm
mm
mi
naut mi
yd
ft
in
1,000 m = .62 mi
1,000 mm = 100 cm = 39.37 in
10 mm = .39 in
.001 m = .04 in
5,280 ft
1.15 mi = 1,852 m
.9144 m
30.48 cm
2.54 cm

### Velocity

Unit of Measure Abbreviation Conversion
kilometers per hour
meters per second
nautical miles per hour
statute miles per hour, or
miles per hour
feet per second
kmph
m/sec
knots

mph
ft/sec
1 knot = 1.84 kmph = 1.15 mph = .514 m/sec
1 mph = .447 m/sec = .87 knot

### Pressure

Unit of Measure Abbreviation
atmosphere
pounds per square inch
millibars
inches of mercury
centimeters of mercury
kilopascal
grams
kilograms
milligram-minutes per cubic meter
atm
psi
mb
in Hg
cm Hg
kP
gm
kg
mg-min/m3