18. Resistance; According to Ohm's law, under constant water temperature, the resistance value R of water is inversely proportional to the vertical cross-sectional area F of the electrode and directly proportional to the distance L between the electrodes.
19. Conductivity; The degree of water's electrical conductivity is called conductivity S (or conductivity).
20.導電率;水の導電率は水の抵抗の逆数であり、通常は水の純度を示すために使用されます。
21. Resistivity: The resistivity of water refers to the resistance between the two opposite sides of a cube of water with a side length of 1CM at a certain temperature. Its unit is ohm*cm (Ω*CM), which is generally a parameter indicating the quality of high-purity water.
23. Desalted water: refers to water in which salts (mainly strong electrolytes dissolved in water) are removed or reduced to a certain extent. Its conductivity is generally 1.0-10.0μs/cm, resistivity (25℃) 0.1--1000000Ω.cm, and salt content is 1.5mg/L.
24. Pure water: refers to water in which strong electrolytes and weak electrolytes (such as SiO2, C02, etc.) are removed or reduced to a certain extent. Its conductivity is generally 1.0-0.1μs/cm, resistivity 1.0--1000000Ω.cm. Salt content <1mg/l.
25. Ultrapure water; refers to water in which the conductive medium is almost completely removed, and the non-dissociated gas, colloid and organic matter (including bacteria, etc.) are also removed to a very low level. Its conductivity is generally O.1-0.055μs/cm, resistivity (25℃)>10×1000000Ω.cm, and salt content <0.1mg/l. Ideal pure water (theoretically) has a conductivity of 0.05μs/cm and a resistivity (25℃) of 18.3×1000000μs/cm.