Physics

Thermal Diffusivity Calculator

Find thermal diffusivity from conductivity, density and specific heat.

Calculated Output

Thermal diffusivity (m²/s) 0.0001

Formula: α = k ÷ (ρ·c_p)

Step-by-Step Breakdown

1. Values used:

2. Thermal conductivity = 400 W/(m·K)

3. Density = 8,960 kg/m³

4. Specific heat = 385 J/(kg·K)

6. Thermal conductivity / Density = 0.0446

7. Thermal diffusivity = (Thermal conductivity x Density) / Specific heat = 0.0446 / 385 = 0.0001m²/s

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The math behind it

α = k ÷ (ρ·c_p). High-α materials reach thermal equilibrium quickly.

Copper (k 400, ρ 8960, c_p 385) → about 1.16 × 10⁻⁴ m²/s.

Why does metal feel cold?

High diffusivity draws heat from your hand rapidly.