Specific gravity is a property that describes how dense something is compared to water (density = 1 g mL ). For instance, sulfur has a specific gravity of 2.0, which means it has a density of 2.0 g mL . The table lists the specific gravity of four common metals. Making instruments to transmit sound is an important technological advancement. If a designer wants to transmit sound as quickly as possible through a wire made of one of these substances, which substance would she choose?