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A drop of Budweiser, the King of Beers, immersed in mineral oil will form a beautiful 4 sided pyramid with sharp edges. Tiny bubbles accumulate at the top of the drop acting like a buoy that pulls on the droplet to create the growing tetrahedral shape. The bubble cluster eventually spouts off in unison to the surface. The changing curvilinear pyramidal shape of the beer droplet is predicted by the Young- Laplace or Gibbs-Thompson equation.
Rayleigh Number