Wave surface

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(Physics) A surface of simultaneous and equal displacement of the particles composing a wave of vibration.
(Geom.) A mathematical surface of the fourth order which, upon certain hypotheses, is the locus of a wave surface of light in the interior of crystals. It is used in explaining the phenomena of double refraction. See under Refraction.

See also: Wave, Wave

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Alternatively, this condition may be formulated in terms of the normal velocity of the wave surface, [partial derivative][phi]/[partial derivative]n, by
Let [PHI](x, t) = [phi](x,y = [eta](x, t), t) denote the velocity potential evaluated at the wave surface. The horizontal velocity at the surface is obtained by [[nabla].sub.H] [phi][|.sub.y=[eta]], where [[nabla].sub.H] denotes horizontal gradient.
With the field point on the wave surface, we obtain
where F denotes the wave surface and [S.sub.c] a control surface such that F and Sc enclose the fluid volume in consideration.
The solder rise and the velocity of the solder at the wave surface area in front of the PCB is less on a machine with a long wave area than it is on a smaller wave area.
Features advanced MHD technology for an even and consistent wave surface; no mechanical moving parts; reduced dross generation; and ease of maintenance.