# Laplace's equation

(redirected from*Harmonic equation*)

## Laplace's equation

[lə′pläs·əz i‚kwā·zhən] (acoustics)

An equation for the speed

*c*of sound in a gas; it may be written*c*= √(γ*p*/ρ), where*p*is the pressure, ρ is the density, and γ is the ratio of specific heats. (mathematics)

The partial differential equation which states that the sum of all the nonmixed second partial derivatives equals 0; the potential functions of many physical systems satisfy this equation.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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