The scientists studied the viscosity of a metallic glass called Ni30Zr70. They found that the viscosity changes with temperature, and they used equations to describe this change. The viscosity increases when the heating rate decreases, and it follows specific equations at different temperatures. By measuring the viscosity at different temperatures, they determined the equilibrium viscosity of the metallic glass. The results show that the viscosity of Ni30Zr70 can be well described by mathematical equations over a range of temperatures.