  It is claimed that all of the pressure scales of the reported melting curves
derived by diamond anvil cell experiments require a correction which takes into
account the pressure thermal shift, where vanadium is an illustrative example.
The linear behavior of the thermal pressure (Pth) vs. the temperature, as
predicted by first principles theoretical assumptions is then experimentally
confirmed. This allows extrapolation to determine of the actual pressure and
thermal temperature at the melt. Accounting for the role of the pressure
transmitting media in diamond anvil cell experiments, the analysis of elemental
vanadium melting curve is presented. It is shown that the appropriate
correction of shock waves melting data which takes into account the radiation
absorbed by the LiF window, applies only to vanadium metal. The correct
pressure scale of vanadium metal as derived by diamond anvil cell is presented.
