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  Home > Data > Submitting Data > Unit Dictionary

  Unit Dictionary

Below are the accepted units in the FSDB organized by unit type.
Please select the 'unit code' to use in the attribute table when submitting data.


Unit Type
Unit Code
Unit NameUnit Description
amountOfSubstance
umol
micromoles micromoles
mmol
millimoles millimoles
mol
moles moles of substance
nmol
nanomoles nanomoles
amountOfSubstanceConcentration
umol/l
micromoles per liter micromoles per liter
amountOfSubstanceWeight
umol/g
micromoles per gram micromoles per gram
meq/100g
milliequivalents per 100 grams milliequivalents per 100 grams
amountOfSubstanceWeightFlux
umol/g*day
micromoles per gram per day micromoles per gram per day
umol/g*hr
micromoles per gram per hour micromoles per g per hour
nmol/g*day
nanomoles per gram per day nanomoles per g per day
nmol/g*hr
nanomoles per gram per hour nanomoles per gram per hour
angle
deg angle
degrees angle 360 degrees comprise a unit circle; degrees used for angle and slope
area
ha
hectares hectares; 1 hectare is 10^4 square meters
cm2
square centimeters square centimeters
km2
square kilometers square kilometers
m2
square meters square meters
mm2
square millimeters square millimeters
arealAmountOfSubstanceConcentrationRate
umol/m2*sec
micromoles per square meter per second micromoles per square meter per second
mol/m2*day
moles per m2 per day moles per m2 per day
arealDensity
number/acre
number per acre number or count per acre
number/ha
number per hectare number or count per hectare
number/m2
number per m2 number or count per square meter
arealDensityRate
number/ha*year
number per hectare per year number or count per hectare per year
number/m2*day
number per m2 per day number or count per square meter per day
m2/ha*year
square meters per hectare per year square meters per hectare per year
arealMassDensity
g/cm2
grams per square centimeter grams per square centimeter
g/m2
grams per square meter grams per square meter
kg/ha
kilograms per hectare kilograms per hectare
kg/m2
kilograms per square meter kilograms per square meter
megag/ha
megagrams per hectare megagrams per hectare
mg/m2
milligrams per square meter milligrams per square meter
tons/acre
tons/acre tons per acre
arealMassDensityRate
g/ha*sec
grams per hectare per second grams per hectare per second
g/m2*day
grams per square meter per day grams per square meter per day
megag/ha*year
megagrams per hectare per year Megagrams per hectare per year
areaPerArea
m2/ha
square meters per hectare square meters per hectare
azimuth
deg az
degrees azimuth degrees azimuth (0-360)
datetime
YYYY-MM-DD
date as date type date as date type, eml-compliant
YYYY-MM-DD hh:mm:ss
date as datetime type date as datetime type, eml-compliant
mmdd
date as month and day date as month, day (4 characters and numbers only - no commas, blanks, slashes, etc)
mmddyy
date as month, day, year date as month, day, year (6 characters and numbers only - no commas, blanks, slashes, etc)
YYYYMMDD
date as year, month, day date as year, month, day (8 characters and numbers only - no commas, blanks, slashes, etc)
day
day of month day of month
julian day
day of year (julian day) day of year (julian day)
month
month of year month of year (MM)
hh:mm:ss
time as datetime type time as datetime type
HHMM
time in military hours and minutes Hours and minutes with hh as military hours and mm as minutes
YYYY
year (yyyy) year (4 character) portion of date
YYYY-MM
year-month year and month as date type
dimensionless
number
number dimensionless number, i.e., ratio, count
%
percent percent; a number
sequential
sequential number a number; sequential numbering
illuminance
molQ/m2*day
moles quanta per square meter per day moles quanta (moles of photons or Einsteins) per square meter per day
latitudeLongitude
deg dec lat-lon
decimal degrees latitude or longitude decimal degrees; latitude (parallel) or longitude (meridian)
deg lat-lon
degrees latitude or longitude degrees; latitude (parallel) or longitude (meridian)
minutes
minutes of a degree the sixtieth part of a degree
seconds
seconds of a degree number of seconds (sixtieth part of a minute of a degree)
length
cm
centimeters centimeters; .01 meters
dm
decimeters decimeters; .1 meters
ft
feet feet; 12 inches
in
inches inches; an imperial measure of length
m
meters meter; SI unit of length
mm
millimeters millimeters; .001 meters
yard
yard yard
mass
g
grams grams; 0.001 kilogram
kg
kilograms kilograms; SI unit of mass
ug
micrograms micrograms
mg
milligrams milligrams
massDensity
g/cm3
grams per cubic centimeter grams per cubic centimeter
g/ml
grams per milliliter grams per milliliter
megag/m3
megagrams per cubic meter megagrams per cubic meter
ug/m3
micorgrams per cubic meter micorgrams per cubic meter
ug/dl
micrograms per deciliter micrograms per deciliter
ug/l
micrograms per liter micrograms per liter
mg/m3
milligrams per cubic meter milligrams per cubic meter
mg/l
milligrams per liter milligrams per liter
mg/ml
milligrams per milliliter milligrams per milliliter
ppm
parts per million parts per million
massFlux
ug/sec
micrograms per second micrograms per second
mg/day
milligrams per day milligrams per day
massPerMass
g/g
grams per gram grams per gram (often in terms of dry weight)
ug/g
micrograms per gram micrograms per gram
mg/g
milligrams per gram milligrams per gram
mg/kg
milligrams per kilograms milligrams per kilograms
o/oo
permil parts per thousand, relative to a standard. for isotopes. Isotope data uses LC-delta=(Rx/Rs-1)*1000
massPerMassRate
ug/g*day
micrograms per gram per day micrograms per gram per day
ug/g*hour
micrograms per gram per hour micrograms per gram per hour
ug/g*week
micrograms per gram per week micrograms per gram per week
ng/g*hr
nanograms per gram per hour nanograms/gram*hour
powerDenisityFlux
langleys
langleys 1 langley= 4.187 Joules per square centimeter; langley per day=0.4846 W per square meter; (W=1 Joule per sec)
megaJ/m2
megaJoule per m2 megaJoule per meter squared
powerDensity
langleys/min
langleys per minute 1 langley= 4.187 Joules per square centimeter; langley per minute=697.8 W per square meter; (W=1 Joule per sec)
megaJ/cm2*year
megaJoule per cm2 per year megaJoule per square centimeter per year
W/m2
watt per m2 watt per meter squared
pressure
atm
atmosphere pressure in bars
mbar
millibars The standard unit of measurement for atmospheric pressure used by the National Weather Service. One millibar is equivalent to 100 newtons per square meter.
bar
pressure in bars 1 bar = 100000 pascals; =0.9869 atmospheres; =0.1 megapascal (MPa); =100 kilopascals (kPa)
specific conductance
uS/cm
micro siemens per centimeter micro Siemens per centimeter
mS/cm
milli Siemens per centimeter milli Siemens per centimeter
specific ultra violet absorbance
SUVA[254nm] l/mg*m
SUVA[254nm] l/mg*m Specific Ultra Violet Absorbance (liter per milligram per meter)
specificActivity
mmol/hr*g
millimol per hour per gram millimol per hour per gram
speed
ft/sec
feet per second feet per second
in/hr
inches per hour inches per hour
m/day
meters per day meters per day
m/sec
meters per second meters per second
temperature
deg c
degrees Celcius Degrees Celsius; a common unit of temperature; constantToSI=273.18
deg f
degrees Fahrenheit Degrees Fahrenheit; an obsolescent unit of temperature still used in popular meteorology; constantToSI= -255.402
time
days
number of days one day excluding leap seconds, 86400 seconds
hours
number of hours one hour excluding leap seconds, 3600 seconds
min
number of minutes of time one minute excluding leap seconds, 60 seconds; the sixtieth part of an hour of time
sec
number of seconds of time SI unit of time; sixtieth part of a minute of time
years
number of years one year excluding leap seconds and leap days, 31536000 seconds (often used for age in years)
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ntu
nephelometric turbidity unit nephelometric turbidity unit
ph
pH units Scale used for pH measurements
volume
acre-foot
acre foot acre foot
cm3
cubic centimeters cubic centimeters
ft3
cubic feet cubic feet
m3
cubic meters cubic meters
l
liters liters; 1000 cm^3
ml
milliliters milliliters; 1/1000 of a liter
volumePerVolume
m3/m3
cubic meters per cubic meter cubic meters per cubic meter
ml/cm3
milliliters per cubic centimeter milliliters per cubic centimeter; also cubic centimeters per cubic centimeter
volumetricArea
m3/ha
cubic meters per hectare cubic meters per hectare
m3/m2
cubic meters per square meter cubic meters per square meter
l/m2
liters per square meter liters per square meter
volumetricAreaRate
cfsm
cubic feet per second per square mile cubic feet per second per square mile
volumetricDensity
cfu/100ml
cfu/100ml Colony Forming Units (CFU)/100ml of Water
volumetricDensityRate
m3/ha*year
cubic meters per hectare per year cubic meters per hectare per year
volumetricRate
cfs
cubic feet per second cubic feet per second
l/sec
liters per second liters per second
ml/min
milliliters per minute milliliter per minute