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Another issue of equal importance is the shape of the droplet. Since it is subject to gravity, it won't be a sphere, which requires perfect symmetry. Nevertheless, we can assume the phenomena of water dripping is due to accumulating mass of itself, until its weight can overcome the adhesive force of whatever nature from upward. This adhesive force, if we designate it as F, then the summation of all its effect, or line integral, can be represented as: ΩF = δ(f_1)ds + δ(f_2)ds + δ(f_3)ds + ......δ(f_n)ds -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 114.44.136.78