Because there are many small protrusions on the surface of the lotus leaf, these protrusions are not only covered with fine hairs, but also covered with a layer of wax crystals. The wax crystals are hydrophobic and non-absorbent. When rainwater Or dewdrops fall on the lotus leaf. Due to the effect of surface tension, the water droplets cannot spread on this layer of waxy hairs and penetrate the lotus leaf. Therefore, the water droplets either roll off or gather into water droplets, and will not wet the entire lotus leaf surface. These The water beads rolling around will take away the dust and sludge on the lotus leaves, which is beneficial to the self-cleaning of the lotus leaves.