Question

What is the SI unit of conductivity?

Answer 1

The SI unit of **conductivity** is the **siemens per meter (S/m)**.

### Explanation:
Conductivity is a measure of how well a material allows the flow of electric current. It is the reciprocal of **resistivity**, which measures how much a material opposes the flow of electric current.

1. **Resistivity (ρ)** is measured in **ohm meters (Ω·m)**.
2. Conductivity (σ) is the reciprocal of resistivity, so:
   \[
   \sigma = \frac{1}{\rho}
   \]
   Therefore, the unit of conductivity becomes the inverse of the unit of resistivity:
   \[
   \text{Unit of conductivity} = \frac{1}{\Omega \cdot m} = \text{siemens per meter (S/m)}
   \]

### Siemens (S):
- The **siemens (S)** is the SI unit for electrical conductance (the ease with which an electric current flows).
- 1 siemens (S) is equal to the reciprocal of 1 ohm (Ω), so:  
  \[
  1 S = \frac{1}{Ω}
  \]

Thus, the **siemens per meter (S/m)** is used to express the electrical conductivity of materials, showing how easily electric current can pass through them.

Answer 2

The SI unit of electrical conductivity is the siemens per meter (S/m). Electrical conductivity measures how easily a material allows the flow of electric current. In simpler terms, it indicates how well a material conducts electricity.

The siemens (S) is the unit of electrical conductance, which is the reciprocal of electrical resistance. Since conductivity is the inverse of resistivity, which is measured in ohm-meters (Ω·m), the unit for conductivity is siemens per meter.