You need a liquid electrical conductor for a project you are working on, and as one possibility you try seawater. You know the number density of the charge carriers and the average time interval between collisions. Your preliminary calculations using Eq. 31. 9 and the mass and charge of an electron give you a theoretical conductivity, \(\sigma_{\text {theory }}\). When testing the seawater, though, you obtain a conductivity less than two thousand times smaller than \(\sigma_{\text {theory }}\left(\sigma_{\text {test }})\). You struggle to understand this discrepancy.

Data from Eq. 31. 9

= neT me