I want to know the answer to the following question:
How much less viscous is lead glass compared with soda glass?
All the background I'm provided with is that "The high ionic radius of the Pb2+ ion renders it highly immobile in the matrix and hinders the movement of other ions; lead glasses therefore have high electrical resistance, about two orders of magnitude higher than soda-lime glass (108.5 vs 106.5 Ohm·cm, DC at 250 °C).". Is that enough to answer the question?