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The conditions governing capillary equilibrium and stability of a fluid interface are stated. A distinction is drawn between hydrostatic (or Laplace) and diffusional (or Kelvin) equilibria, which is often of practical importance in the behaviour of real liquids. In the light of these principles, the fluid physics experiments proposed for the first Spacelab payload are discussed, with particular reference to the rotational stability of a fluid cylinder in microgravity and to processes used to grow large single crystals of pure materials.

Capillary equilibrium and stability in liquids under microgravity