Grahams Law Of Diffusion/Effusion

                                                                       Diffusion/Effusion

Grahams Law Of Diffusion And Effusion 

Grahams Law Of Diffusion/Effusion 1848

Strictly Grahams Law relates to Effusion 

Grahams Law Of Effusion : Velocity Of Gas Molecules/Mass Of Molecules 

Examples 

When a perfume is sprayed in one corner of the room, its fragrance can be felt in the entire room. This is because of the diffusion phenomenon. The rate at which the fragrance spreads across the room is inversely proportional to the square root of the density of the molecules of the gas contained in the perfume and can be evaluated with the help of Graham’s law of diffusion or effusion.

Balloons 

When an inflated balloon is pierced with the help of a sharp object, the gas molecules tend to escape through the hole pierced in the balloon. The escaping of gas molecules through the small opening in the balloon represents the effusion process. The time taken by the gas molecules to completely escape and the balloon to get properly deflated can be calculated with the help of Graham’s law of effusion or diffusion. The rate of effusion is different for different gases.

                                                                  Snapshot 

One can easily observe the application of Graham’s law in real life by lighting an incense stick and observing the behaviour of the smoke molecules generated by it. This is because the smoke coming out of the burning incense stick spreads in the surroundings quickly with the help of the diffusion process.