Some correct non-examples are:
A glass half-empty;
Anything in two dimensions;
The amount that covers something.
Step-by-step explanation:
Volume is the amount a three-dimensional shape will hold.
If we measure the amount of liquid in a glass, this is volume. We also refer to this situation as the glass half-full.
If we talk about the glass being half empty, we are not referring to the amount that is in the glass, we are referring to the empty space. While this would describe how much could potentially go in there, this is not an example of volume.
Anything in two dimensions would not be volume.
The amount of surface something covers is a two-dimensional measurement, and therefore not volume.