ABSTRACT
A slip velocity at the contact line of a liquid drop on a solid surface originates because of the force induced by the gradient of the chemical potential in the liquid along the solid–liquid interface. Einstein’s equation is used to relate the slip velocity and the force. The gradient occurs because (a) the interaction potential at the liquid–solid interface near the contact line due to the neighboring molecules differs from that of a semi-infinite liquid and depends upon the distance from the contact line and (b) the chemical potential is pressure dependent.
