https://zh.ketiadaan.com/post/a-homogeneous-iron-ball-with-a-density-of-77gcm3-put-it-into-a-beaker-full-of-gasoline-with-a-density-of-075gcm3-and-if-300-gw-of-gasoline-overflows-the-buoyancy-of-the-iron-ball-is-yes