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The Physics of Hard Spheres Experiment (PHaSE) is a NASA Lewis Research Center fluid physics space flight experiment whose purpose is to investigate the behavior and physical properties of a colloidal dispersion of hard spheres. The Microgravity Science Division of the NASA Lewis Research Center has the responsibility of implementing the PHaSE space flight experiment. Onboard STS-94 and STS-83 MSL-1.

The Two Phase Flow (TPF) experiment characterized microgravity operations and
demonstrated reliability of a capillary pumped loop (CPL) containing multiple
evaporators. CPL's are being developed at NASA's Goddard Space Flight Center and
are the next major thermal control innovation since heat pipes.

Payload on STS-85