Yes, solids keep their volume.
Solids have a definite volume and gases have a variable volume
No, solids have definite volume and shape
Solids have a fixed volume or shape at room temperature or pressure.
No
Solids.
...V1xV2...
All solids of the same measurements have the same volume regardless of density or mass.
solids and liquids
Yes, all solids have a volume.
Yes they do
Yes.