Which metal in Nebuchadnezzar's statue had the highest specific gravity?
Gold had the highest specific gravity of the metals in Nebuchadnezzar's statue. The image's head was pure gold, and the context explains that specific gravity, or density, was heaviest at the top, with gold exceeding silver, brass, iron, and the iron-clay mixture below.
Les teaches that the statue seen by Nebuchadnezzar had a head of pure gold, chest of silver, belly area of brass, legs of iron, and feet made of a mixture of iron and clay. He explains that anyone with a concept of science or mathematics will see that specific gravity, or density, is heaviest at the top. Gold has the highest specific gravity of these elements, while the iron and clay at the bottom have the lowest. So, as Les puts it, the image is top heavy and has no stability from an engineering standpoint. Daniel's interpretation also describes the stone cut out without hands, which Les identifies as Christ.