In this work, a simple bead‐spring (dumbbell) model is employed together with the Langevin analysis to show that the master curves for stress must be made in terms of the groupS/ρT,andSis the stress tensor,Tthe absolute temperature, and ρ the density of the solvent. The time‐temperature shift factor is shown to beηs(T0)T/ηs(T)T0,whereηs(T)is the solvent viscosity at temperatureT.