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Where is cohesion and where is adhesion : in milk, tea, coca cola,water fall, stream...

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cenicienta | (Level 1) Valedictorian

Posted January 22, 2012 at 7:44 AM via web

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Where is cohesion and where is adhesion : in milk, tea, coca cola,water fall, stream water coming out of a faucet, sprite, muddy water, glass of water?

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bandmanjoe | Middle School Teacher | (Level 1) Senior Educator

Posted January 22, 2012 at 9:55 AM (Answer #1)

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Both of these have to do with intermolecular forces holding substances together.  Cohesion is a force between molecules that are all of a similar nature, a physical property of a substance that causes the molecules of that substance to unite together.  Adhesion is any attraction between dissimilar molecular species that can potentially bring them into direct contact.  Adhesion is the tendency of dissimilar particles and/or surfaces to cling to one another.

So, that being the case, here is where I see cohesion (particles that are similar): milk, tea, coca cola, sprite, glass of water, and stream of water coming out of a faucet.

For adhesion (particles of a dissimilar nature), I say:  water fall and muddy water.  (milk could be argued here as well, since it is a colloid suspension of particles within an aqueous solution)

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