If a solid that has a mass of 25 melts it should result in a?

If a solid with a mass of 25 grams melts, it will result in a liquid with the same mass of 25 grams, assuming no material is lost during the melting process. The physical state changes from solid to liquid, but the mass remains constant according to the law of conservation of mass. The volume may change depending on the properties of the material, but the mass will stay the same.