what are the units of stress strain and young’s modulus
Young's modulus Young's modulus is the ratio of stress (which has units of pressure) to strain (which is dimensionless), and so Young's modulus has units of pressure. Its SI unit is therefore the pascal (Pa or N/m2 or kg·m−1·s−2). The practical units used are megapascals (MPa or N/mm2) or gigapascals (GPa or kN/mm2).
Viscosity The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.[1] For liquids, it corresponds to the informal concept of "thickness": for example, honey has a higher viscosity than water.[2]