Density is expressed in weight per volume. Metric units are preferred but in the United States the Ango-Saxon units are still widely used. The current implemented spreadsheet allows any combination of weight and volume.
Metric units of weight:
(1) microgram
(2) milligram
(3) gram
(4) kilograms
Metric units of volume:
(1) cubic millimeter (microliter)
(2) cubic centimeter (cc)
(3) cubic meter
Common expressions are grams per cubic centimeter and kilograms per cubic meter.
US (anglo-Saxon) units of weight:
(1) ounces (avoirdupois)
(2) pounds
US (Anglo-Saxon) units of volume:
(1) cubic inch
(2) cubic foot
(3) cubic yard
Common expressions are ounces per cubic inch and pounds per cubic foot.
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