Density of a material is defined as its mass per unit volume.
ρ (in some countries i.e. USA) is also defined as weight per unit volume
Units: (kg/m³), g/cm³
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Arif

Arif
Interfacial tension and centrifugal forces balanced at mechanical equilibrium.
Interfacial tension of any liquid that gives a shape very close to a cylinder at the equilibrium point, can be estimated using Vonnegut’s expression:
ω : angular velocity; (radians per second, degrees per second, revolutions per second)
Δρ : difference between two fluid: the lessdense and the dense

Arif
Statistical Mechanics Basis of Macleod’s Formula. M.E. BOUDHHIR and G.A. MANSOORI. Journal of Physical Chemistry, Volume 94, pp.83628364, 1990.
The famous formula of Macleod, relating the surface tension of a liquid in equilibrium with its own vapor to the oneparticle densities in the two phases of the system, is derived. Proved using the statistical mechanical definition of the surface tension.
(Later on Mansoori worked with Escobedo)

Arif
Escobedo and Mansoori (AIChE J. 42(5): 1425, 1996)Found original paper: check Escobedo 1996The proposed 1996 paper relates the surface tension of mixtures to bulkphase concentrations and properties (i.e. densities). Surface tension of pure organic fluids σ:
The two ρ are densities: liquid and vapour.
They introduced parachor (
P
), a new expression, derived from statistical mechanics (from Macleod equation) which represents the experimental surface tension of 94 different organic compounds within 1.05 AAD% (average absolute deviations).(Kumar 2005) It expresses the surface tension of a liquid in equilibrium with its own vapour. Historical reference for parachor cited here: Macleod, Sugden, Quayle, Escobedo.