units

Here is a subset of controlled unit terms for Environmental Systems Science (ESS) samples, using existing ontology terms from Units Ontology (UO) link to ontology term details (IRI for term).
Please provide feedback on any additional unit terms needed.
Unit category
Unit Label
UO ID
length
meter
​http://purl.obolibrary.org/obo/UO_0000008​
length
centimeter
​http://purl.obolibrary.org/obo/UO_0000015​
length
millimeter
​http://purl.obolibrary.org/obo/UO_0000016​
length
micrometer
​http://purl.obolibrary.org/obo/UO_0000017​
area
square meter
​http://purl.obolibrary.org/obo/UO_0000080​
area
square centimeter
​http://purl.obolibrary.org/obo/UO_0000081​
area
square millimeter
​http://purl.obolibrary.org/obo/UO_0000082​
area
square micrometer
​http://purl.obolibrary.org/obo/UO_0010001​
mass
kilogram
​http://purl.obolibrary.org/obo/UO_0000009​
mass
gram
​http://purl.obolibrary.org/obo/UO_0000021​
mass
milligram
​http://purl.obolibrary.org/obo/UO_0000022​
mass
microgram
​http://purl.obolibrary.org/obo/UO_0000023​
mass
nanogram
​http://purl.obolibrary.org/obo/UO_0000024​
mass
picogram
​http://purl.obolibrary.org/obo/UO_0000025​
volume
cubic meter
​http://purl.obolibrary.org/obo/UO_0000096​
volume
cubic centimeter
​http://purl.obolibrary.org/obo/UO_0000097​
volume
cubic decimeter
​http://purl.obolibrary.org/obo/UO_0000100​
volume
milliliter
​http://purl.obolibrary.org/obo/UO_0000098​
volume
liter
​http://purl.obolibrary.org/obo/UO_0000099​

sample metadata sources

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