Question: 1.5 For a rough surface, we measured the contact angle for a water droplet sitting on the zoom-in flat surface, which equals 0, = 60.

1.5 For a rough surface, we measured the contact angle for a water droplet sitting on the zoom-in flat surface, which equals 0, = 60. The projected area ratio is @ = 0.1. Determine the macroscopic observed contact angle 0 in a unit of degree

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