Abstract
Positive and negative line tensions have been reported in the literature based on studies of the drop size dependence of contact angles. The ambiguity regarding the sign of line tension may be caused by the roughness and the heterogeneity of real solid surfaces on which the contact angles are measured. However, for a sessile drop on an ideal solid surface, it is demonstrated that the line tension is a positive quantity as required by considerations of stable thermodynamic equilibrium.
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