Depends on the size, but probably cubic centimetres, litres or cubic metres.
The volume of a solid is measured in cubic units
m3
When you need to find volume of an irregular solid or a liquid.
Either litres or cubic metres.
When you are measureing smaller units you would use mL
A cubic metre.
It is cubic cm.
none
Density can be expressed as (any unit of mass) divided by (any unit of volume). My personal favorite is [ slug per hogshead ] .
Volume is measured in cubic units.
metric conversion
The Unit for volume is the same. Volume is usually measured in Litres. For larger volumes cubic metres can be used: 1 m³ = 1000 Litres.