Surface penetration of liquid (blue) and gas (orange) into a solid (gray) substrate at the contact line of a liquid droplet.

From the article:

Wetting and Contact-Angle Hysteresis: Density Asymmetry and van der Waals Force
Fei Wang (王飞) and Britta Nestler
Phys. Rev. Lett. 132, 126202 (2024)

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