Metrology toolkit · 02

Conductivity and resistivity, without unit ambiguity.

Reciprocal-property conversion and cell-constant calculations with explicit SI traceability and temperature scope.

Electrical properties

Choose a calculation path.

NIST model · SI units

Temperature compensation

Normalize conductivity to a controlled reference temperature.

ModelMeasured at

°C

Reference

AS MEASURED

Temperature normalization is off; results remain at the measurement temperature.

ρ = 1 / κ

Convert between volume resistivity (ρ) and electrical conductivity (κ) through canonical Ω·m and S/m units.

Input propertyValueInput unit

Output unit

Resistivity

1 MΩ·cm

1 µS/cm × reciprocal SI relationship

Controlled-use scope

Linear compensation is solution-specific. The 2.0%/°C model is an aqueous estimate near room temperature; use a validated custom coefficient when the procedure or certified material provides one.

Calculation basis

Conductivity is the reciprocal of volume resistivity. For a cell, κ = Kcell/R. Optional linear normalization uses κref = κmeasured/[1 + α(Tmeasured − Tref)]. Composition, temperature range, electrode geometry, frequency, and the validated coefficient remain part of the measurement procedure.

NISTNIST IR 8250, SOP 52 — Verification and Adjustment of Digital Conductivity Meters NISTNIST SP 260-142 — Primary Standards and Standard Reference Materials for Electrolytic Conductivity BIPMThe International System of Units (SI), 9th edition, version 4.01 NISTNIST SRM 3192 certificate — Electrolytic Conductivity Standard