What is resistivity?

Resistivity is a fundamental property of a material that quantifies how strongly it opposes the flow of electric current. It is commonly used in various fields, including geophysics (for subsurface exploration), materials science (for characterizing materials), and medicine (e.g., electrical impedance tomography). In geophysics, variations in subsurface resistivity can indicate different geological formations, groundwater, or mineral deposits. In materials science, it helps determine the suitability of materials for electrical applications. In medicine, it can be used to image internal body structures and functions.