Final answer:
The mean time between collisions for electrons in a gold wire is a measure of electrical conductivity.
Step-by-step explanation:
The concept described in the question pertains to the average time between collisions for electrons in a gold wire, which is referred to as the mean time between collisions. This falls under the topic of Electrical conductivity measure. The mean time between collisions gives an indication of how often electrons collide with other particles or atoms within the gold wire, impacting the flow of electric current.