depends. what is the cube made of?
an ice cube is solid. a hollow plastic cube is solid, but if you have a 5 sided box that is basically a cube without a top, and fill it with water, you have a water, filling the volume of the box, in a cubed shape.
can you be more specific? ===================== A cube could be solid but, as the old song goes, it ain't necessarily so. A cube is just a three dimensional figure. It could exist entirely within your mind. Think of cubes as being lengths, widths, heights, angles, volumes, etc.
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cube
cube
A solid box is a cube.
A CUBE
A cube has six faces (sides).