Abstract
To measure the diameter and the terminal velocity of the naturally falling raindrops, consecutive images of the falling raindrops were taken by using the ultra-high-speed video camera developed by the authors. The terminal velocity and the diameter of the raindrops were calculated from these images.
As a result, the behavior of the raindrops that moved downward along with the time passage was clearly observed from the consecutive images, and the relationship between the terminal velocity and diameter was obtained.
