density unit gram per prefixed litre prefixed gram per litre prefixed gram per prefixed litre unit 単位 gram per cubic centimetre gram per kubieke centimeter gram per cubic metre gram per kubieke meter gram per litre gram per liter kilogram per cubic decimetre kilogram per kubieke decimeter kilogram per cubic metre kilogram per kubieke meter microgram per cubic centimetre microgram per kubieke centimeter milligram per cubic metre milligram per kubieke meter solar mass per cubic parsec zonsmassa per kubieke parsec unified atomic mass unit per cubic angstrom