diffusion is an ongoing process, how the diffusion gradiants are maintained?
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when the concentration has been equal, no more hipertonic and no more hipotonic
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Examples of diffusion (the moving of particles, usually atoms or molecules, from a concentrated area to a less concentrated area) can be found just about everywhere.\nExamples-\n1: The mixing of food coloring into water\n2: The process of sugar, salt, etc. dissolving into any liquid\n3: The scent of perfume/colonge spreading throughout a closed room\n4: (similar to 3) The spreading of smoke in a room\n5: (an indirect example) The moving of water up a paper towel (known as osmosis)\n\nOther examples are everywhere.
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Diffusion is the spontaneous spreading of something such as particles, heat, or momentum. The phenomenon is readily observed when a drop of colored water is added to clear water, or when smoke from a chimney dissipates into the air. In these cases, diffusion is the result of turbulent fluid motion rather than chemical reactions or the application of external force. In cell biology, diffusion is described as a form of "passive transport", by which substances cross membranes. \n\nOsmosis is the diffusion of a solvent through a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. The semipermeable membrane is permeable to the solvent, but not to the solute, resulting in a chemical potential difference across the membrane which drives the diffusion.
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because it goes against the concentration gradient (goes from an area of low concentration to an area of high concentration). It is a common example of active transport.
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In the absense of additional information or context the basis for this question rests in the size of the molecule. The smaller molecule will have a greater rate of diffusion than the larger molecule.  In general size of molecules is directly proportional to their molecular weight. When all molecules are the same molecular weight you will need to consider which ones are smaller based on the attractive forces between them. \n\na)  CO and N2 - N2 has a triple bond (the Ns are held closely to each other therefore small) and is very stable and I would bet that it will diffuse faster than CO since its actual size is smaller and because it is stable it is less likely to react with any medium through which it is diffusing.\nb) No2 and SO2 - this is likely to be based on size with the larger SO2 diffusing more slowly.\n\nHope this helps.
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Osmosis is the movement of water across a barrier.  Diffusion is the movement of other molecules, not necessarily across a barrier. Check out - \nhttp://www.madsci.org/posts/archives/feb2000/951455351.Cb.r.html for a more detailed answer on what diffusion is compared to osmosis.
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I bet you could look this up on the web pretty easily. Why didn't you try?\n\nI bet the diffusivity is pretty good, however, because otherwise, how could fish breathe?
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The zig zag motion of freely suspended particles in a medium is called brownian motion.
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doing things in detail and w/ persistance.
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Not sure what you mean... \nAn example of simple diffusion is that of steroid hormones which diffuse readily through the cell mebrane and reach their target molecules within the cell.\n\nFacilitated diffusion you have for example for the uptake of many hydrophilic/charged nutrients from the blood. The concentration of the nutrient is higher on the outside of the cell, yet it cannot simply diffuse through the membrane; it needs the help of transport proteins.\n\nActive transport means that the cell needs to import something uphill its gradient, using energy. The most profound example is the Na+/K+  ATPase which pumps Na+ out of the cell and K+ into the cell using ATP (both Na+ export and K+ import are uphill processes).\n\nA beautiful combination of passive and active transport is seen in the intenstinal epithelial cells. The concentration of glucose in the gut is lower than inside the cell. So the human body needs to consume energy and actively import glucose. This happens via a symporter that imports Na+ together with glucose. The import of Na+ is downhill so it releases energy which is used for the uptake of glucose. Once the glucose is inside the epithelial cell it will be passively exported to go to to the bloodstream.
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It is an ongoing process.Lead by example. Peace.
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sanjana,\n                diffusion is natural mixing of particle .if u have reddish brown bromine gas in test tube with another test tube above the gas u will find that the red colouration of bromine gas will soon spread to the test tube on the top.in same way if liquid ink is left in bottom of teat tube full of water it will spread evenly throughout the water.a solid crystal of pottasium manganate if left in water will also naturally spread throughout by diffusion,but its colour spread more slower than gases or liquids.diffusion can only take place if matter is made of particles.if matter had been coninuous there would not have been enough space for liquid and solid to mix together.\ndiffusion take place much more quicker w gases than w liquids or solids.evidence for this is way smells travel.gases r generally lighter than liquids and solids therfore their particles move more quickly.in fact rate of diffusion is inversly related to mass of particle.therefore a dense gas like carbon dioxide with heavy molecules diffuse more slowy than lighter gas hydrogen\ndo u know why i have written\nbecause i am ur neighbour\nfrom pakistan\nif u need my help,plz contact through im or email\nfor web resources\nsearch at google and wikipedia\nali\npakistan
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Diffusion of a Dye in Hot and Cold Water\n\nPurpose:  The purpose of this experiment is to demonstrate the principle of diffusion.  Diffusion is the net movement of particles (atoms, ions, or molecules) from an area of greater concentration to areas of lesser concentration.\n\nMaterials and Methods:  For this experiment, the student will require a projector, two petri dishes, two 150 ml beakers, hot plate, potassium permanganate (purple dye), and a spatula.  Obtain about 50 ml of cold water in one beaker and about 50 ml or boiling water in the other.  Place the petri dishes on the projector and add cold water to one dish and boiling water to the other.  Allow the water in the dishes to become still.  Using the spatula, add a crystal of potassium permanganate to the center of each dish\n\nExperiment:  Observe the experiment for several minutes and note what happens to the purple dye in each petri dish.\n\nConclusion:  Do you observe diffusion in each?\n\nHow does the rate of diffusion differ? \n\nWhy is there a greater rate of diffusion in one
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The potential energy stays the same.
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Denser materials can "float" in the sense of remaining suspended, if they are small enough; think of candle soot. The particles must be small enough so that their fall rate is dominated by their air resistance rather than their weight. Such floating is also helped by brownian motion.
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A balloon filled with helium will deflate a little bit every day, because helium atoms diffuse out of the balloon through its wall \nWhen 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. \nCarbon dioxide bubbles in soft drinks start as small nuclei and grow because of the diffusion of carbon dioxide molecules towards them \nHeat diffuses through the walls of a mug filled with hot coffee \nA 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 \nInk in a beaker of water is an example of diffusion. In the end, the ink particles spread evenly throughout the mass of water
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It would depend on several factors. Small, uncharged molecules can pass through the cell membrane through diffusion. When it is water, it is called osmosis. Diffusion can only occur into the cell when the concentration of the substance is greater outside the cell than within it, and likewise only out of the cell when the concetration is greater inside the cell than outside. This is called the concentration gradient.\n\nWhen the molecule is charged or is large (such as a chlorine ion or a lactose molecule), it requires active transport by carrier proteins. There are also carrier proteins that help to transport against the concentration gradient.\n\n[Edit] \nAfter thinking for a bit, I believe it would be pertinent to include something about the more complex methods of active transport.\n\nThere are two "directions" of the complex forms of active transport: in (endocytosis) and out (exocytosis).\n\nExocytosis is when a vesicle, after being released from the Golgi complex, fuses to the cell membrane, releasing the contents.\n\nEndocytosis is done by three main means: Phagocytosis, Pinocytosis, and Receptor-Mediated Endocytosis.\n\nPhagocytosis is the process of enveloping a large particle, such as how many unicellular organisms "eat" other organisms. The large particle comes in contact with the cell membrane, stimulating the formation of a vesicle. This vesicle then enters the cell and depending on the contents may fuse with a lysosome to help to digest it.\n\nPinocytosis also forms a vesicle, but differs from phagocytosis because it forms a much smaller vesicle.\n\nReceptor-mediated endocytosis is when particles that cannot normally enter the cell bond to receptor proteins embedded in the cell membrane. These proteins then congregate and form a vesicle. \n\nIn all forms of endocytosis and exocytosis, ATP is required for energy.