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