= Healing length
{title2=$\ell_h=\hbar/\sqrt{2mgn_0}$}
The <healing length> of a repulsive homogeneous condensate is the length at which density-gradient <kinetic energy> and interaction <energy> balance. The displayed convention sets the dimensionless <Laplacian> coefficient to one in the stationary <Gross–Pitaevskii equation>. A hard-wall <number density> profile has width $\sqrt2\ell_h$; definitions without the factor $\sqrt2$ occur, so the equation and convention must be specified.
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