What's the difference between conductivity and conductance?

Conductance (siemens) is a property of a specific object—depends on size and shape. Conductivity (S/m) is a material property—independent of geometry. Conductance = Conductivity × Area / Length. Same material can have different conductance depending on dimensions.

Why do dissolved ions increase water conductivity?

Ions are charged particles that can carry current through solution. Pure water has very few ions (just H⁺ and OH⁻ from self-ionization). Dissolved salts add many more charge carriers. More ions = higher conductivity. That's why seawater conducts much better than pure water.

How does temperature affect conductivity?

For metals: conductivity decreases with temperature (atoms vibrate more, impeding electron flow). For solutions: conductivity increases with temperature (ions move faster, less viscous). Semiconductors vary depending on doping. Always specify measurement temperature.

Conductivité électrique Converter

About Electric Conductivity Conversion

Electric conductivity (specific conductance) measures a material's intrinsic ability to conduct electric current—conductance normalized by geometry. It's the reciprocal of resistivity (σ = 1/ρ) and independent of sample size or shape. Unlike conductance which depends on an object's dimensions, conductivity is a material property: copper has the same conductivity whether it's a thin wire or a thick bar. This makes conductivity ideal for comparing materials and specifying their electrical properties.

The SI unit is siemens per meter (S/m). Conductivity spans an enormous range—over 24 orders of magnitude from excellent conductors like silver (63 MS/m) to near-perfect insulators like fused quartz (10⁻¹⁷ S/m). Temperature significantly affects conductivity: metals decrease as temperature rises while electrolyte solutions increase. Conductivity is crucial for material selection in electronics, water quality monitoring and treatment, semiconductor device fabrication, geophysical surveys, and electrochemical analysis.

Our converter handles all standard electric conductivity units from MS/m to pS/m scales.

Common Electric Conductivity Conversions

From	To	Multiply By
S/m	mS/cm	0.01
mS/cm	S/m	100
S/m	μS/cm	10
μS/cm	S/m	0.1
S/m	S/cm	0.01
mS/cm	μS/cm	1,000
S/m	mho/m	1 (equivalent)
MS/m	S/m	10⁶

Electric Conductivity Unit Reference

Siemens per meter (S/m) – The SI unit of electrical conductivity, representing the conductance of a 1-meter cube measured between opposite faces. For metals, megasiemens per meter (MS/m) is more practical: copper ≈ 58 MS/m, aluminum ≈ 37 MS/m. The relationship to resistance is: R = L/(σA), where L is length and A is cross-sectional area.

Microsiemens per centimeter (μS/cm) – The dominant unit for water quality measurements worldwide. Provides convenient numbers for the conductivity range of natural waters: ultrapure water 0.055 μS/cm, distilled 0.5-3 μS/cm, drinking water 50-500 μS/cm, seawater ~50,000 μS/cm. Equal to 10⁻⁴ S/m or 0.1 mS/m. Water treatment plants, aquariums, and hydroponics systems routinely measure in μS/cm.

Millisiemens per centimeter (mS/cm) – Used for more conductive solutions where μS/cm values become unwieldy. 1 mS/cm = 1000 μS/cm = 100 S/m. Common for seawater, brines, and concentrated electrolytes. Industrial process water and cooling tower water are often monitored in mS/cm.

Percent IACS (%IACS) – International Annealed Copper Standard, a relative conductivity scale where annealed copper at 20°C equals 100%. Silver ≈ 106% IACS (slightly better than copper); aluminum ≈ 61% IACS; gold ≈ 70% IACS. 100% IACS = 58.0 MS/m exactly. Widely used in the wire and cable industry to specify conductor quality.

Megasiemens per meter (MS/m) – 10⁶ S/m, the practical unit for metallic conductors. Copper: 58 MS/m; silver: 63 MS/m; aluminum: 37 MS/m. Convenient because it avoids scientific notation for common conductors. Semiconductor literature sometimes uses this unit for heavily doped materials.