does density affect sound velocity ? i know sound velocity is dependent on inertial and elastic properties but does it depend on density ? or just molecular mass ? if two objects having the same atomic mass , but one has higher density than the other due to the difference in bonding wouldn't velocity of sound be greater in the one with higher density ? i understand that velocity of sound decreases in larger atoms , because they have more mass, but wouldn't that be accompanied by larger volume causing their density to actually decrease ?