Final answer:
Viscosity is the property that represents a fluid's resistance to flow, while electrical resistivity is a property indicating how much a material opposes electrical current flow, with symbols n and ρ respectively.
Step-by-step explanation:
The characteristic of matter that expresses the resistance to flowing is known as viscosity. Viscosity is a measure of how much a liquid opposes flow, with higher viscosity indicating a thicker fluid and greater resistance to flow. The viscosity of a material is often indicated by the symbol n, and it has a significant effect on how fluids behave when being poured, pumped, or sipped through a straw.
In the context of electrical resistivity, this property reflects how much a material opposes the flow of electrical current. The resistivity, represented by the Greek letter rho (ρ), is an intrinsic property of the material and is the reciprocal of electrical conductivity. For instance, gold and copper have low resistivity, meaning they are good conductors and allow electrical current to flow easily.