Difference Between Effusion And Diffusion

Effusion And Diffusion are more likely discussed topics in chemistry. both terms are just the properties of gases. however, some of us are very confused about effusion and diffusion. The Major Difference Between Effusion And Diffusion is that effusion is a process by which gas molecules pass through a tiny hole under pressure like air sneaks from balloons while diffusion is a tendency of molecules to move from high concentration regions to low concentration regions. the effusion movement is easy and diffusion is high.

In this post, you are going to learn about the Difference Between Effusion And Diffusion step by step with Diagrams.

This Post Also Includes:

  • An overview of Difference
  • Difference Table
  • Examples of Effusion
  • Examples of diffusion
  • Lots more

So if you want to get benefits from this post you’ll love this post.

Let’s Dive right in..

Effusion vs. Diffusion – An Overview

The mixing of two gases with each other is known as diffusion. in this sense, the aroma of the meal is a common example of diffusion. when we enter a room, we felt smell. it is due to the mixture of two gases with each other due to diffusion. on the other hand, effusion is a different phenomenon which is an escape outside from the container or vessel through a little crack or opening.

the speed of escaping molecules is directly proportional to the effusion rate. this direct proportion tells us that heavy gas molecules are more effusive and lighter gas comparatively effuse faster than heavy gas molecules. 

Difference Between Effusion and Diffusion in Tabular Form



Effusion starts when gas molecules escape through a small crack into a vacuum or outside of the vessel.

Diffusion starts when one gas mixes with another gas and due to the collision between each other molecules release their energy.

It is promoted by a difference of pressures

It is promoted due to the difference in concentrations.

Effusion simply an ability of gas to travel through a small crack or opening

Effusion simply an ability of gases to mix with each other usually in the absence of a barrier.

When the mean free path of the molecules is greater than the aperture of the whole effusion is occurred.

When wholes are larger than mean free path or no wholes are present diffusion is occurring.

Particles move faster and molecules do not collide with each other.

The particle kinetic energy and their sizes impact the diffusion rate.



















What is Effusion?

the effusion has different meanings in physics, chemistry, and the Medical field. the escape of gas molecules from the wall of a container or whole is said to be EFFUSION in physics and chemistry while in the medical language it is referred to as the accumulation of fluid in an anatomic space having no loculation.

return to the chemistry definition, the diameter of the whole must be smaller than the molecule’s mean free path. this smaller hole or crack often said as a pinhole. effusion only occurs due to the difference of pressure between the interior of gas molecules and the exterior of the container.

In this given condition all molecules come closer to the hole they start escaping from their position to the exterior of the container. on the other hand, if the diameter of the mean free path increases molecules obey Sampson flow law.

subdural, pericardial, and pleural effusions and mastoid are common examples of effusion.

Examples of Effusion

  • Pressing a deodorant button
  • The separation of uranium 238 into uranium 235
  • Turn a burner knob to turn it on or off
  •  A flatulence
  • A helium canister with a leak
  • Astronaut gas tubes
  • A hot air balloon presenting a leak
  • The propelled backpacks
  • A balloon deflating
  • A gas cylinder with a small leak through which it travels to another compartment or to the outside.

What is diffusion?

Examples of diffusion

  • When making coffee, the aroma is usually spread throughout the room.
  • The smell of a rotten egg in a container
  • The perfume of flowers in a closed place
  • Aromatic essences
  • A pleasant or not a pleasant aroma that spreads throughout a room
  • Cigarette smoke is an airtight room
  • When a person perfumes himself and enters a room and everyone can smell his perfume
  • The smell of a scented candle, incense, or match
  • The smoke that cars give off
  • The smell of rotting food in the fridge
  • Smoke from chimneys in homes or factories

Graham’s law of diffusion

Graham’s law of diffusion states that if the conditions for temperature and pressure are equal then the rate of diffusion of gases is inversely proportional to the square roots of their molar masses.

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