The electrical conductance of a single porous SnO2 ribbon, synthesized from dimethyldineodecanoate tin using electrospinning and metallo- organic decomposition techniques, has been measured using the two- probe method in atmosphere following a cycle of heating from 300 to 660 K and subsequent cooling from 660 to 300 K. During the heating, the conductance ( G) is relatively insensitive to the temperature below 380 K and, above that, follows an Arrhenius relation with a thermal activation energy of 0.918 +/- 0.004 eV until 660 K; upon cooling, G follows the same Arrhenius relation until 570 K and, below that, observes another Arrhenius relation with a lower activation energy of 0.259 +/- 0.006 eV. After a cycle of heating and cooling, G returns to a value higher than its initial one. The Arrhenius relations are attributed to the surface adsorption and desorption of moisture and oxygen, and the G hysteresis between 300 and 380 K is attributed to the partial replacement of adsorbed oxygen by moisture because of the porous nature of the ribbon surface.