Just like the work function, the Volta potential depends sensitively on surface state, contamination, and so on.
2.
The Volta potential however corresponds to a real electric field in the spaces between and around the two metal objects, a field generated by the accumulation of charges at their surfaces.
3.
The Volta potential is " not " an intrinsic property of the two bulk metals under consideration, but rather is determined by work function differences between the metals'surfaces.
4.
The total charge Q over each objects'surface depends on the capacitance C between the two objects, by the relation Q = C \ Delta \ psi where \ Delta \ psi is the Volta potential.
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