Your question is poorly worded. However, I think you are asking: "A solid usually has a fixed volume; why?" It's a matter of degrees - literally. Very few solids have a fixed volume without a context of temperature and pressure. A given volume of virtually any solid will be altered by temperature.
A solid has a fixed shape and volume and cannot be compressed
solid
solid
a solid
A solid
A solid has a fixed volume and form. A liquid has a fixed volume but has the form of a container. A gas has not a fixed volume or form.
Sponge is a solid as it has a fixed shape
a fixed position
A solid has a fixed volume and does not change shape.
There are three states of matter, solid, liquid and gas. The state of matter wherein particles are fixed in a rigid structure is solid.
yes
Shape