Answer: Hello there!
We know that solids can expand or contract when their temperature changes, so solids don't have a fixed volume.
Because the volume can vary, then the density that is mass over volume also can change.
And with the same reasoning, the length can change.
The mass of a solid does not change with the change of temperature, so the mass is invariable, which means that the weight is a fixed quantity.
The shape is also fixed, the volume can increase o decrease a little, but the solid maintains the shape.
Then the two common properties of all solids are fixed weight and shape.
