6. Saxon Bowl

A bowl with a hole in its base will sink when placed in water. The Saxons used this device for timing purposes. Investigate the parameters that determine the time of sinking.

1. 打算用什么碗，怎么打孔，材料是怎么，碗和杯子有没有区别？
2. 观察其下沉的过程，需要多长时间，需不需要用录像来观察？

http://stemfellowship.org/iypt-2020-references-2/iypt-2020-reference-problem-6-saxon-bowl/