Diffusion Coefficient Calculator

Find a diffusion coefficient (Stokes-Einstein).

Diffusion coefficient (m²/s) 0

Formula: D = kB·T ÷ (6π·η·r)

Step-by-step with your numbers:

1. Values used:

2. Temperature = 298 K

3. Viscosity = 0.0009 Pa·s

4. Particle radius = 1 nm

6. Diffusion coefficient = 0m²/s

Did we solve your problem today?

The Stokes-Einstein relation gives how fast particles diffuse in a fluid.

The math behind it

D = kB × T ÷ (6π × viscosity × radius), kB = 1.38 × 10⁻²³ J/K.

1 nm particle in water at 298 K → ~2.5 × 10⁻¹⁰ m²/s.

Bigger particle?

Diffuses more slowly (D ∝ 1/radius).