Thermal Conductivity Calculator
Solve Fourier's law for any variable in heat conduction.
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Select which variable to solve for, then enter the other four values. The calculator uses Q = kA(delta T)/d to find the missing quantity.
About Thermal Conductivity
Fourier's law of heat conduction (Q = kA delta T / d) relates the heat transfer rate to the material's thermal conductivity, cross-sectional area, temperature difference, and thickness. This equation is fundamental in engineering for designing insulation, heat exchangers, and building envelopes. Thermal conductivity varies enormously across materials, from diamond (2,000 W/m K) to aerogel (0.01 W/m K).
Frequently Asked Questions
What is thermal conductivity?
Thermal conductivity (k) measures how well a material conducts heat. Higher values mean better heat conduction. Metals have high k (copper: 385 W/m K), insulators have low k (fiberglass: 0.04 W/m K).
What is the relationship between thermal conductivity and insulation?
Better insulators have lower thermal conductivity. R-value (thermal resistance) equals thickness divided by conductivity. Higher R-values mean better insulation.
How does thickness affect heat transfer?
Heat transfer rate is inversely proportional to thickness. Doubling the thickness of insulation halves the heat loss, all else being equal.