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.
none
It is cubic cm.
Volume is measured in cubic units.
Density can be expressed as (any unit of mass) divided by (any unit of volume). My personal favorite is [ slug per hogshead ] .
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.