How to use a function(adsbygoogle = window.adsbygoogle || []).push({}); f[x,y,z]to describe the shape of water surface when a tiny object is floating on it based on surface tensionONLY?

Assume there is a tiny object floating on the water surface because of the surface tension, then the water surface will be deformed obviously. So how can we use a functionf[x,y,z]to describe the shape of water surface? (x,y,z) is a set of coordinate system of 3D space.

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# Object floating on the surface of water

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