basic

Graham's Law of Effusion Rate Ratio Calculator

Rate₁/Rate₂ = √(M₂/M₁) — lighter gas effuses faster.

Applies Graham's law: the effusion rate ratio = √(M₂/M₁), where M is molar mass. Also computes the time for gas 1 to effuse given the time for gas 2.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

g/mol
g/mol
s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

r₁/r₂ = √(M₂/M₁)

In depth

Applies Graham's law: the effusion rate ratio = √(M₂/M₁), where M is molar mass. Also computes the time for gas 1 to effuse given the time for gas 2.