液体表面张力系数、声波在液体中传播速度与液体浓度关系的研究

Studies on the Relationship between the Liquid Surface Tension and the Spread Velocity of Sound Wave in Liquid and the Liquid Concentration

通过实验的手段研究了氯化钠与蔗糖溶液的表面张力系数及声波在其中的传播速度与浓度关系,发现随着浓度的增加,表面张力系数与液体中的声波传播速度近似于线性变化。然而,两种液体中两个物理量的变化快慢不同,氯化钠溶液明显比蔗糖溶液变化快;从分子动理论角度,对此现象作了圆满的解释,说明两个物理量之间有着较密切的关联,也研究了温度变化时,两个物理量的变化情况。

In this paper,based on experiment,the relationship between the surface tension,the spread velocity of sound wave in liquid and the liquid concentration in NaCl and C12H22O11 solutions is studied.The results show that the surface tension and the spread velocity of sound wave almost increase linearly with the increasing of solution concentration.However,the raising rates of these two physical quantities,surface tension and the spread velocity,for NaCl and C12H22O11 solutions,are different：the rate for NaCl solution is obviously faster than the one for C12H22O11 solution.The phenomena are successfully explained from the viewpoint of molecular kinetic theory,revealing the correlations between the liquid surface tension and the spread velocity of sound wave in liquid.Temperature dependence of these two physical quantities is also explored.