Comparison on the mixture rules of sound velocities used in characterizing biomedium components

In this paper, several mixtrue rules of sound velocity and their usefulness in characterizing the components of biomedium are analysed. It is pointed out that for characterizing the components of biomedium, the rules are compatible with each other under cartain conditions, and the errors between each rule and real sound velocity are different. It concludes that there is no general rule suitable for various media among above rules.