Conductivity, in general, may be of many types. It could be electrical, ionic, hydraulic, or thermal conductivity. However, conductivity is basically defined as a material’s ability to conduct electricity or heat. Apart from that, measurements are done in several ways and there are specific units of conductivity that are used depending on the circumstances. We will learn about some of the units below.
SI Unit of Conductivity
When we talk about electrical conductivity, the SI unit of conductivity is siemens per meter (S/m) or mho and is usually represented by Greek letter sigma, σ and its formula is given as;
As for the si unit of thermal conductivity, it is measured in watts per meter-kelvin (W/(m K)) or watts per centimetre-kelvin (W/(cm K)). It is represented by the formula;
K is the thermal conductivity in W/m K,
Q is the amount of heat transfer through the material in J/s or W,
A is the area of the body in m2
ΔT is the difference in the temperature in K.
Other Conductivity Units
Some other units of conductivity also include ohm- meter, BTU, tog, clo, R-value, U-value, ppm, EC, TDS, and CF.