Volume and number of the particles in the juice from scum change gradually since long time solid-liquid contact.
由于固液接触时间长，浮渣滤汁中胶体粒子体积和数量的变化比较平缓；
The higher the surface energy of the solid substrate in relation to the surface tension of the liquid, the better its wettability, and the smaller the contact Angle.
较高的表面能量的固体基质有关的表面张力的液体，它的更好的润湿性，较小的接触角。
The liquid surface is not distorted upon contact with the solid.
液体与固体接触时液体表面不受干扰。
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