# Graham's Law Calculator

Graham's law states that the rate of effusion (or of diffusion ) of a gas is inversely proportional to the square root of it's molecular weight. The measure of rate at which two gases mix is the rate of diffusion, and the measure of rate at which a gas escapes through a pinhole into a vacuum is the rate of effusion. Use this online Graham's law calculator to calculate the rate of effusion or diffusion of a gas.

## Calculate Rate of Effusion or Diffusion of a Gas

### Example:

Let us know how the given Graham's Law Formula works to find the rate of effusion or diffusion of a gas given the values, Rate 2 = 8, Mass 1 = 9, Mass 2 = 7 respectively.

#### Solution:

Rate 1 / Rate 2 = √(Mass 2 / Mass 1)

Rate 1 = √(Mass 2 / Mass 1) x Rate 2

Rate 1 = √ (7 / 9) x 8

= 7.055