论文部分内容阅读
在喝浓汤或用淀粉作浆糊时,当你用勺子搅拌出漩涡状后,把勺子拿起来,用眼睛盯着漩涡看几秒。你会发现漩涡在停止转动前的那一瞬间,会出现逆转。这种现象反映了液体的一个重要特征。这是一个什么特征呢?
When you drink a thick soup or use a starch to make a paste, when you use a spoon to whirl up, pick up the spoon and watch it with your eyes for a few seconds. You will find that the vortex will reverse in the moment before it stops. This phenomenon reflects an important feature of the liquid. What is the characteristic of this?