Difference Between Diffusion and Osmosis

Main Difference – Diffusion vs Osmosis

These are two processes that are involved in the transfer of material from one position to another. However, by definition they are very different from each other. The main difference between diffusion and osmosis can be identified by their definitions themselves. Diffusion is the net transfer of molecules/ material from a high concentration zone to a low concentration zone. Osmosis is the transfer of a solution through a semi-permeable membrane from a region of low concentration to a region of high concentration.

What is Diffusion

Diffusion can take place across any medium. It is most common among gasses and liquids. This is the net transfer of solute molecules from an area of high concentration to an area of low concentration. It is said to be concentrated when there are a lot of solute molecules occupying a small area of space. And when the opposite takes place, it is said to be low in concentration. There is a natural tendency for materials to move from a high concentration zone to a low one until they become similar in concentration. At this point, it can be thought that the net transfer of solutes is ‘0.’

This kind of movement is due to the empty space present in the medium, allowing the solutes to move through space. Therefore, diffusion can be taken as an example to prove that matter is not continuous. Few examples for this process include; the smell of a perfume hitting our nose (due to the movement of scent molecules through the medium of air), the spread of a dye through a glass of water (the dye molecules move through the empty spaces present in the water medium to fill equally fill the glass).Difference Between Diffusion and Osmosis

What is Osmosis

This process involves the movement of a solution through a semi-permeable membrane from a low concentration zone to a high concentration zone. A semi-permeable membrane is a membrane that is only able to let certain types of material pass through it; usually it allows the passage of liquid molecules and prevent the entry of solids. In contrast, a fully permeable membrane would have no control of the material that pass through it.

In the case of osmosis, two solutions with different concentrations are kept separated by a semi-permeable membrane. What happens in this case, is that the region with more solution flows through to the region with less solution in order to level the concentrations. However, since the term ‘concentration’ is defined based on the solutes instead of the solution, the transfer of solution is said to take place from an area of high concentration to an area low concentration. An ideal example for a semi-permeable membrane that is found naturally is the cell membrane. And a good example of osmosis would be the entrance of water into a cell. When there is no net movement of solution across the membrane, the system is said to be at osmotic pressure.

Main Difference - Diffusion vs Osmosis

Difference Between Diffusion and Osmosis


Diffusion is the net transfer of solute molecules from a region of high concentration to a region of low concentration.

Osmosis is the transfer of solution across a semi-permeable membrane from low concentration zone to a high concentration zone.

Need of a Membrane

Diffusion doesn’t occur through a membrane.

Osmosis occurs through a semi-permeable membrane.

Type of Material Transferred

In diffusion, it is the solute molecules that get transferred through a medium of space.

In osmosis, it is the solution that moves from one region to another.

Direction of Movement

Diffusion takes place from a region of high concentration to a region of low concentration.

Osmosis takes place from a region of low concentration to a region of high concentration.Difference between Diffusion and Osmosis - infographic

Image Courtesy:

“Blausen 0315 Diffusion” by BruceBlaus – Own work. via

“0307 Osmosis” by OpenStax College – Anatomy & Physiology, . Jun 19, 2013..  via

About the Author: admin

Related pages

edible and eatablesimple distillation definition chemistryautism spddifferentiate between conductor and insulatordefinition symbolism in literaturehow to instal viber on pcentropy vs enthalpyare amino acids monomersdefine horatian satirevernier caliper and micrometer screw gaugemetric tons mtbarometric pressure vs atmospheric pressuresedentary agriculture definitionhypertonic vs hypotonic solutionsexample of a interrogative pronounfermentation and anaerobic respiration differencemarginal cost and absorption costquotation marks or inverted commascold blooded organismsmt metric tonnehow to conjugate ir verbs in frenchrelationship between absorbance and wavelengthhaploid and diploidmeaning of cold blooded animalsmitochondria vs chloroplastgoose and duck differencedefinition of sashimididactic talesdifference between prosocial behavior and altruismfunctions of smooth and rough endoplasmic reticulumwhat is a smooch kissdifference between calorimeter and spectrophotometerrefrigeration and air conditioning cycledifference between renewable and nonrenewable energyhow to claim gst at sydney airportpnp npn transistordifference between whipping cream and heavy whipping creamalkene propertiescompare and contrast command economy and free market economydefinition of pteridophyteswhy are glucose and fructose isomersmeaning alludewhat is the difference between verse and stanzadifference between kwashiorkor and marasmushow to determine the theme of a poemsore vs soaromnicient definitionwhat is the difference between emphysema and copddestructive waves definitionwhat is the molecular formula for cyclohexanetypes of literary imagerydifference turtles and tortoisesthe indian flag colours meaningdefine boiling point in chemistrydifference between embolism and thrombosisexample of alternate rhymewhat is the difference between alkali and alkaline earth metalsdifferentiate rotation and revolutionnervous breakdown definitionrhyme & rhythmtransverse binary fission definitiongrimm brothers hansel and gretel summarysometime versus some timenonmetallic lustertotipotent and pluripotentprepare bank reconciliation statement examplewhat does edt mean in time zonesalliteration in poemsfudge vs chocolateferrous ferricdefine moanedwhat is the difference between imperative and declarative sentencesacculturation vs assimilationdifference between a pail and a bucketparaphrasing vs summaryzener diode vs diodedifference between a porpoise and a dolphinnervous breakdown definition symptomswhat is the formula for cpiwhat is the difference between king and emperor