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Osmosis and diffusion

Is it right to say that osmosis always involves a semi-permeable membrane instead diffusion may or may not involve a membeane? Is this a diffrence between the 2 processes?
Reply 1
Original post by popangel
Is it right to say that osmosis always involves a semi-permeable membrane instead diffusion may or may not involve a membeane? Is this a diffrence between the 2 processes?

Yes, pretty much. Osmosis describes the movement of water across a partially permeable membrane, whereas diffusion describes the movement of any substance from an area of high to low concentration.
Original post by popangel
Is it right to say that osmosis always involves a semi-permeable membrane instead diffusion may or may not involve a membeane? Is this a diffrence between the 2 processes?

yep that's fine. They normally say 'partially permeable membrane' as for osmosis, so perhaps try and learn that term instead?
and diffusion is just the movement of particles from a high conc to a low conc, no membrane needed.
Reply 3
Original post by Jpw1097
Yes, pretty much. Osmosis describes the movement of water across a partially permeable membrane, whereas diffusion describes the movement of any substance from an area of high to low concentration.

Thank you very much :smile:
Reply 4
Original post by harlz_chalamet
yep that's fine. They normally say 'partially permeable membrane' as for osmosis, so perhaps try and learn that term instead?
and diffusion is just the movement of particles from a high conc to a low conc, no membrane needed.

Thank you very much:smile:
Reply 5
Also, it's the net movement of water across a partially permeable membrane. Water can move in both waves across the membrane but most of it moves to one area (wherever there's a higher water potential). Make sure you use those keywords or else you can lose some marks! :smile:
Reply 6
Original post by coco:)
Also, it's the net movement of water across a partially permeable membrane. Water can move in both waves across the membrane but most of it moves to one area (wherever there's a higher water potential). Make sure you use those keywords or else you can lose some marks! :smile:

Very true, and the same applies to diffusion.

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