what is water conductivity?
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Water is not a good conductor of electric current it conducts electric current because of the impurities present in it.\n\nWhy?\n\nWith this simple experiment you can verify that the distilled water presents a very low conductivity because the potential of the first circuit is much less than the developed by the battery. The small potential of this circuit is due to the presence of the H+ and OH- ions produced when some molecules of water are dissociated. However, the number of molecules of water that are dissociated is practically negligible, making the distilled water a weak electrons conductor. It is worth noting, that as the distance among electrodes increases, the resistance to the electrons transfer in the distilled water increases considerably. This fact evidences even more the low conductivity of the distilled water.\n\nWhen salt is added (NaCl) to the system, the conductivity of the system increases considerably. The water not only dissolves the salt, as well as it dissociates the salt molecule. The elementary sodium (Na) presents an excess electron and the chloride (Cl) has a strong affinity for electrons. Consequently, after dissociation, the sodium loses an electron to the chloride, forming Cl- and Na+ ions. The presence of these ions increases the conductivity of the water considerably. The positive ions (Na+) migrate to the negative electrode (linked to the pole - of the battery) and the negatives (Cl-) migrate to the positive electrodes (linked to the pole + of the pile). The conductivity of the aqueous solution water/salt is proportional to the ions concentration in the solution.\nWhen you try to measure the conductivity of tap water you can verify that it has higher conductivity in comparison with distilled water because this contains ions (less pure). The tap water has higher conductivity due to the presence of the ions: Ca2+ and Mg2+. And don´t forget, try the science at home!
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Capillary forces and water potential.  The water potential is the tendency of water to move from one place to another, due to evaporation or stuff dissolved in the water.
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Salt water can conduct electricity because there are ions in it. Na+ and Cl- from the salt.\nSee http://www.scienceaid.co.uk/salt.html for more
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Electrolytes- compounds which when dissolved in water produce solutions that conduct an electric current. \n\nNonelectrolytes- compounds which when dissolved in water produce solutions that do not conduct an electric current.
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Chemically pure water is an electrical insulator.\n\nEven the least impurity, even the least amount of any dissolved ion, will convert it into a conductor.  Even dissolved CO2 will provide the ionic activity to make water conductive
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Sending information through water molecules....\nWell, I suppose you could send an electric current as a signal through the water (providing some type of electrolyte is present), this could be a way of sending information.\nWater molecules are constantly moving/sloshing around, getting mixed up.  If you try to arrange the molecules a certain way in order to send information, they wont stay like that long.
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Pure water is a poor conductor but when you have water on a surface, you basically have an electrolyte solution that allows electricity to flow much easier.
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I remember this question since it was on the test once:\n\nList the following kinds of matter by how well they conduct heat (from the best to the worst): Wood; air; metal; water.\n\nMy answer was the correct one and it was: Metal; water; wood; air.
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yes.  saltwater is salty, meaning it has a lot of ions.  Lots of ions conduct electricity.
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Unless you are talking about pure water there will be at least some impurities in the water making it a weak conductor.  It is for this reason that water tends to short circuit electrical appliances and that you are told to keep them away from and out of the water.  If you are going to put it under water, water proof it.
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Osmosis is a type of diffusion that relates directly to water passing the cell membrane. Diffusion is particle movement down the concentration gradient or to an area of less concentration of any substance
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Convection is heat transfer by motion of a heat carrying medium.  It is a process where air or liquid moves the heat from one surface to another.
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Salt (or more specifically, Sodium Chloride salt) is a strong electrolyte, meaning that when dissolved in water it will completely break up into ions (Na+ and Cl- ions).\n\nPure water, by itself, does not conduct electricity, but when you dissolve an electrolyte in it, an electric current can pass through the solution.\n\nIn order for a electric current to flow there must be charge carriers which can move.  Pure water does not have these charge carriers, but after a salt is dissolved and ions are present in solution, the solution becomes conductive.
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It really depends on how free electrons are to move with depends on how the molecules are bonded together. So, covalent bonds, like those in glass, has the electrons constrained to an individual molecule, so they are not free to move much. The same is true of solid ionic bonds, like salt. However, an electrolyte like salt, dissolved in water makes a good conductor because the ions are free to move through the water,  so a current can flow though it. Metals are good conductors because the electrons are not constrained to a particular atom or area, the entire metal bonds together by sharing its electrons across the entire metal, and so they are free to move making it a good conductor for electricity.\n\nEdit: Despite what has been said, the number of valence electrons is not a great way to determine conductivity. For example, most metals, which are very good conductors, have two (and some, like gold I believe, have only one), whereas carbon, which is used in resistors because it doesn't conduct electricity as well, has four valence electrons.
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what is the water cycle??
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Becaue water is polar and water molecules form hydrogen bonds with each other.
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Conduction- the transfer of heat to a particle of matter without the movement of matter itself.\n\nConvection- the transfer of heat to a particle of matter with the help of movement of the matter.\n\nRadiation- the transfer of energy through electromagnetic waves.