| 摘 要： | 1 IntroductionAs was shown by Jacobson's free length theory in liquids that the relationship between thefree length of liquid molecule L, liquid density p and ultrasonic velocity c is[1]where K is temperature dependent constant, which has been given in Table 1 at various temperatures.In liquids, ultrasonic velocity is closely related to molecular structure and conditions ofpressur and temperature. Even if pressure and temperature are constants, different liquidshave different ultrasonic velo…
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