;+
; NAME:
; vt3d_thermalinertia
; PURPOSE: (one line)
;  Return thermal inertia
; DESCRIPTION:
;  Return thermal inertia
; CATEGORY:
;  Volatile Transport
; CALLING SEQUENCE:
;  therminertia = vt3d_thermalinertia(dens, specheat, thermcond)
; INPUTS:
;  dens : density of the substrate (g/cm^3)
;  specheat : specific heat (erg/(g K))
;  thermcond : temperature of the substrate (erg/(cm s K))
; OUTPUTS:
;  therminertia : thermal inertia, cgs units (erg cm^-2 s^-1/2 K^-1)
; RESTRICTIONS:
; PROCEDURE:
;  Many, many places, including:
;  Young, L. A. 2016, Volatile transport on inhomogeneous surfaces: II. Numerical calculations (VT3D)
;   Resubmitted to Icarus.
;   Eq 3.2-5
; MODIFICATION HISTORY:
;  Written 2011 Aug 10, by Leslie Young, SwRI
;  2016-04-28 Moved to vt3d library
;-

function vt3d_thermalinertia, dens, specheat, thermcond

    return, sqrt( thermcond * dens *specheat )

end