In electrolyte solutions, charged ions move and transfer electrons under the influence of an electric field, thus exhibiting conductivity. The portable strength of its conductivity is called conductivity S. Because conductivity is the reciprocal of resistance, the method of measuring conductivity can be to insert two electrodes into a solution to measure the resistance R between the two electrodes. According to Ohm's law, at a constant temperature, this resistance is proportional to the distance L (cm) between the electrodes and inversely proportional to the cross-sectional area A (cm) of the electrodes. Conductivity is the ability of a solution to conduct electrical current expressed numerically. The conductivity of water is related to the amount of inorganic acids, bases, and salts it contains. When their concentrations are low, the conductivity increases with increasing concentration. Therefore, this indicator is commonly used to estimate the total concentration or salt content of ions in water. Conductivity (G) is the reciprocal of resistance (R). Therefore, when two electrodes (usually platinum electrodes or platinum black electrodes) are inserted into a solution, the resistance R between the two electrodes can be measured. According to Ohm's law, at a constant temperature, this resistance value is proportional to the electrode spacing L (cm) and inversely proportional to the electrode cross-sectional area A (cm2), that is, R=ρ × (L/A), where ρ is the resistivity, which is the resistance of a conductor with a length of 1cm and a cross-sectional area of 1cm2, and its magnitude depends on the nature of the substance. According to the above formula, the conductivity (G) of a conductor can be expressed as follows: G=1/R=(1/ρ) × (A/L)=K × (1/J), where K=1/ρ is the conductivity and J=L/A is the electrode constant. The conductivity of an electrolyte solution refers to the conductivity of two parallel electrodes that are 1cm apart when filled with 1cm3 of solution. As can be seen from the above equation, when the electrode constant (J) is known and the solution resistance (R) or conductivity (G) is measured, the conductivity can be calculated