12. Rice Kettlebells 米壶铃

Take a vessel and pour some granular material into it, for example, rice. If you dip e.g. a spoon into it, then at a certain depth of immersion, you can lift the vessel and contents by holding the spoon. Explain this phenomenon and explore the relevant parameters of the system.

取一个容器，并倒入一些颗粒状物质，如大米。如果把勺子浸入其中，并达到一定浸入深度，你就可以通过勺子举起该容器及其内部颗粒物质。解释这一现象并探索系统的相关参数。

筷子插在米中竟然能提起一整瓶米！