Dielectric constant (ϵr): The dielectric constant measures how much a material can reduce or enhance the strength of an electric field compared to empty space.
Capacitance:Capacitance is a measure of how much charge can be stored on an object per unit voltage applied across it.
Electric displacement field (D): The electric displacement field represents the total amount of electric flux per unit area that passes through a surface, including both free charges and bound charges.