Liquids and gases have only _________ expansion.

1. Liquids and gases exhibit only cubical expansion.
2. It is because they have no fixed length or area but have fixed volume.
3. Liquids and gas do not have a definite length or area but have a definite volume.
4. Thus., the only expansion in liquids is volume expansion or cubical expansion.

Hence, liquids and gases have only cubical expansion.