Final answer:
The most significant factor that affects a fuel sample's conductivity reading is temperature.
Step-by-step explanation:
The most significant factor that affects a fuel sample's conductivity reading is temperature.
The warmer the solution, the higher the solubility of the material being dissolved and therefore the higher the conductivity as well. However, gas solubility typically decreases with increasing temperature, which can have a negative impact on conductivity in cases where dissolved gases contribute to the overall conductivity.