2006-09-01 23:00:13 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
Diffusion, being the spontaneous spreading of matter (particles), heat, or momentum, is one type of transport phenomena. Diffusion is the movement of particles from higher chemical potential to lower chemical potential (chemical potential can in most cases of diffusion be represented by a change in concentration). It is readily observed for example when dried food like spaghetti is cooked; water molecules diffuse into the spaghetti strings, making them thicker and more flexible. It is a physical process rather than a chemical reaction, which requires no net energy expenditure. In cell biology, diffusion is often described as a form of passive transport, by which substances cross membranes.
Examples of diffusion
* A balloon filled with helium will deflate a little bit every day, because helium atoms diffuse out of the balloon through its wall
* When spaghetti is cooked, water molecules diffuse into the spaghetti strings, making them thicker and more flexible. Adding salt to the water reduces diffusion by reducing the osmotic pressure.
* Carbon dioxide bubbles in soft drinks start as small nuclei and grow because of the diffusion of carbon dioxide molecules towards them
* Heat diffuses through the walls of a mug filled with hot coffee
* A gas distributes itself over a room by diffusion
* A sugar cube in a glass of water that is not stirred will dissolve slowly and the sugar molecules will distribute over the water by diffusion
* Ink in a beaker of water is an example of diffusion. In the end, the ink particles spread evenly throughout the mass of water
2006-09-02 00:43:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Movement of a fluid from an area of higher concentration to an area of lower concentration. Diffusion is a result of the kinetic properties of particles of matter. The particles will mix until they are evenly distributed.
Example:
H2S(g) in a test tube will slowly diffuse into the air of a lab until equilibrium is reached
2015-07-30 21:41:23 · answer #2 · answered by john 4 · 0⤊ 0⤋
An example is an opaque window or shower door.
Light is "Diffused" when passing thru.
2006-09-01 23:03:52 · answer #3 · answered by ? 6 · 0⤊ 0⤋
diffusion means diffuse of one element into another for example carbon into steel , nichel into cuppor . it depond on several factors : temperature , pressure , diameter of element, coofecient of diffuse , time .
2006-09-02 00:28:05 · answer #4 · answered by eshaghi_2006 3 · 0⤊ 0⤋
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2006-09-01 23:07:40 · answer #5 · answered by ♦cat 6 · 0⤊ 0⤋
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2006-09-01 23:04:29 · answer #6 · answered by Hmmmm 1 · 0⤊ 0⤋