Question

What is diffusion what is osmosis give an example of each?

Answer 1

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DIFFUSION

Diffusion is the movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. A good example of diffusion is food colouring. If you place a drop of red food colouring in a beaker of water eventually the entire beaker of water will have a red tint. The food colouring moved through the water until it was equally distributed throughout the beaker.

*Other everyday examples of diffusion are:

1. Sugar will diffuse through tea until the entire cup of tea is sweet. (We stir the tea to speed up the diffusion.)

2. The odour of food cooking diffuses throughout the kitchen. If you open the kitchen door it will spread into the next room.

OSMOSIS

Osmosis is a special example of diffusion. It is the diffusion of a substance through a semipermeable membrane from a more dilute solution to a more concentrated solution. This process is also passive since no external energy is needed.  A semipermeable membrane is a barrier that permits the passage of some substances but not others. Cell membranes are described as selectively permeable because not only do they allow the passage of water but also allow the passage of certain solutes (dissolved substances).

*Some major examples of osmosis:

1.  Absorption of water by plant roots.

2. Reabsorption of water by the proximal and distal convoluted tubules of the nephron.

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