To determine which sample materials could be liquids from the description provided, we need to look at their characteristics of shape and volume:
- Liquid: Typically has no definite shape (it takes the shape of its container) but has a definite volume.
Based on the table:
- Sample W: No definite shape, no definite volume (this is characteristic of a gas, not a liquid).
- Sample X: No definite shape, definite volume (this is characteristic of a liquid).
- Sample Y: No definite shape, no definite volume (this is characteristic of a gas, not a liquid).
- Sample Z: Definite shape, definite volume (this is characteristic of a solid, not a liquid).
Based on this information, the only sample that could be a liquid is Sample X.
So the answer is X.