Question: what does the greek letter rho mean in physics
Answer: In the physical sciences to represent : Densities : mass density , air density or charge density ( ρ ) Resistivity ( ρ ) Rho meson ( ρ , ρ , ρ ) General quantum states Hammett Equation , ρ is used to represent the reaction constant , this is independent of the position and nature of the substituents of the benzene ring .