A rigorous physical test performed by Bagnold proved that dust can fly up to 3000m high over great distances with wind, while sand grains can move at most by means of saltation near the land surface.

• 拜格诺用严格的物理实验证明，尘粒能随风远走高飞，而沙粒却只能在地面附近跳跃前进。