Cary L. Brown said:
The problem with the "Trek" incarnation of these things is that they're inconsistent with the REAL science it's based upon. Trek "sonic showers," supposedly, use no water. This is illogical and irrational, but not too surprising... the folks writing about it most often had no idea of the science behind it.
To be fair, water droplets are clearly visible
on the Ilia-Probe's shoulders, and if one has the iTunes version of ST:TMP
(my copy is of the 1979 cinema edit but I believe Apple has since changed it to the DE
) on their computer pressing the fast-forward on the QuickTime Player during that segment reveals - at least to me - steam being blown down on Khambatta which is otherwise almost completely obscured by the "mood light" animation effect.