I generally agree with this answer and the idea, that the tags we have should denote subfields of physics or meaningful keywords as applied by physicists.
But tags just denoting thermodynamic or kinematic variables, basic quantities used in certain subfields, etc look to me not meaningful enough to categorize qustions. In addition, creating such tags for every thermodynamic and kinematic variable or for every basic quantity applied in any subfield would largely inflate the number of tags we have.
Concerning the particular tags listed here, it seems to me that the thermodynamic variables are already covered by thermodynmaics, the kinematic variables by kinematics, capacitance by electrostatics, etc ...