Are temperature and pressure the ONLY factors that affect the state of water?
917266
No.   A study was done by a japanese physicist that proved that the actual molecular structure of water changes as a reaction to the emotional environment around it.  \n\nFor example, a happy environment causes the molecules to form beautiful snowflake-like shapes.  While, an angry environment will cause it to look very jagged and forboding.   \n\nI know that sounds pretty crazy, but there's proof of it.  And nobody knows why that is.
89038
Also pressure from cold water sinking in some areas, thus causing it to rise in others, such as the Peruvian coastline (produces La Niña), the ac5tion of prevailing winds on both warm and oold surface waters.  Also water entering the oceans from large rivers such as the Amazon and Mississippi, and also salt concentration (dense water sinking).\n\nTidal currents are caused by the combined effects of the sun and the moon, the strongest when their effects combine.\n\nHeat and cold also affect water density, causing the ocean suface to be higher in hot areas and depressed in cold areas.\n\nGenerally these effects keep water circulating.  Some lack of movement is possible where all are missing from a given area, such as the Sargasso Sea.
457329
This has to do with the optical properties of water as it enters a new so-called phase; from liquid to solid. The liquid and solid state of water are two macroscopic phases, which means that the collective behaviour of the water molecules changes drastically as the temperature, in this case, drops below T = 0 degrees Celsius. As the molecules behave differently in the solid state than in the liquid state, e.g. they reflect light in a different manner due to their structural arrangement, it is not surprising that water has a different color when it freezes compared to when it is a liquid.
704476
Pressure is basicall a fluctuation in the relative amounts of particles in any given volume. But what causes the differences in the particles per volume, The SUN. I'll ask you-what happens to a gas when the temperature is raised?\n\nThink about it, and you'll be on your way to understanding pressure.
429160
At a higher elevation the pressure on the water is less therefore it will boil at a lower temperature than it would at sea level.\n\nA liquids state of matter depends on pressure and temperature to make something from liquid to gas you use high temperature and low pressure.
10515
water freezes at 32 F.  When you add other substances to water, you create a soliable compound and the solution takes on some of the quality of the other substance.  Adding salt or sugar prevents the solution from freezing at 32 F. Juices or bullion cubes would work in a similar manner.  if you're going camping, sleep with your water in your sleeping bag ;)
766447
water is able to maintain its temperature well. it retains its temperature better than other substances when the surrounding environment has a different temperature.\n\nfor example, think about the temperature of the ocean's water at the beach. during the day, the sun shines, and both the water and sand absorbs heat. but the water is cooler than the sand. but during the night, it is warmer than the sand because it is able to better retain its heat.\n\nthat might be the reason why make a pool of water in their crops.
902070
In weight, it's the same. No mass has been added or taken away by heating it or cooling it down, weight doesn't care about tempurature except possibly at phase changes.\n\nIt does however become more dense until about 4 degrees centigrade, so water of a certain volume at 4 degrees centigrade ways more then water of the same volume at 10 degrees centrigrade. This is because the 4 degree centigrade water is more dense so to get the same volume you need to add more mass.
795646
fluid is a state of matter ie water is in a fluid state where stam is in a gasous state\nim not familiar with this theory but tempurature affects viscosity because if the temp goes up  or down the state of the matter changes ie at 0c water frezes at 100c water boils\ni also think viscosity ischecked by how fast a fluid flows down an incline or by how fast it is absorbed by a wicking substance ie filterpaper
1097232
Have you heard of boiling and freezing points. Each substance has a boiling and a freezing point there is a different one for each substance. The freezing point of H20 (hydrogen and oxygen) is 32 degrees Fahrenheit and the boiling point is 212 degrees Fahrenheit. Now these temperatures could be different if the water has anything else in it changing the molecular structure. Things like salt, calcium, ect. So in your bottle story....The gas (common air) which has things like helium, carbon and oxygen is on top and your water is on the bottom. This could get confusing but essentially when you shake it up you added other molecules into the water that have a lower or higher freezing point. Same idea as when you have a partially frozen bottle of water and you shake it up and it defrosts. It also has to do with the first law of thermodynamics...Energy can not be created or destroyed just transferred. So some molecules do not have enough energy to bond with one another but when you shake up the bottle it transfers energy allowing them to bond with one another. Hope I didn't confuse you too much.
117878
The depth of water also has effect. The shallower the water the warmer. The deeper the colder. So water in the tropics, near the equator and shallow should be warmest.\nSee the link below.
264363
Good thinking, unlike some of the answers here. Anything put in or on the water displaces water and makes the water level rise. The ocean is so huge that you could not measure it unless the rock was so large you could not move it.
21135
water on the ground, in oceans, lakes, etc. has enough energy to evaporate a little bit (all liquids have a "vapor pressure," which is higher the hotter it is).  eventually, there is too much water in the air at whatever air temperature it is, so the water re-liquifies and falls.  this can commonly happen when a warm front (warm air holds lots of water) is cooled by a cold front.
933014
All decent explanations so far; I hope I can add to what has already been posted.\n\nLiquid and Ice most definitely can exist at the same temperature and Ice can be and often does get colder than 0C.\n \nFirst of all the Triple Point of water is the pressure and temperature at which Ice, Liquid Water and Water Vapor exist at the same time in equilibrium.  Vapor is the right word, not steam although you can argue that the only time that Water Vapor and Steam are the same thing is at a very low pressure.  The Triple point of water only happens at a near perfect vacuum, 0.0063 ATM to be precise.\n\nAdding Salt to water will lower the freezing point, but then it isn't water anymore, it's salt water.  Even so, Liquid Salt Water and Ice Salt Water can also exist at the same place and time at the same temperature, slightly below 0C.  But let's stick to water.\n\nIce can easily be lower than 0 degrees.  Consider a bucket of water, liquid water sitting outside and the air temperature is -10C.  Little by Little, as the liquid reaches 0.0098 C, liquid starts to become ice.  The ice crystals form in the bucket, around the walls of the bucket and on the surface first.  The air is still -10C so the bucket, the liquid and the ice will keep getting colder.  The ice on the surface will drop to slightly below 0C but very slowly since it is still absorbing the heat of the not-yet-frozen water.  Eventually, the entire bucket of water will be frozen and will be just below 0C.  First the walls of the bucket will reach -10C (same as the air tempertaure).  The ice near the walls of the bucket and on the surface will reach -10C first, continually absorbing the heat energy from the relatively warmer ice near the center of the bucket.  Until finally, the entire bucket of ice is steady at -10C.  That is until the sun comes out or the day gets warmer.\n\n\nAnd by the Way, dry ice is not water, it's frozen CO2 (Carbon Dioxide)\n\nOne more thing, at a near perfect vacuum, you can actually cool liquid water to less than 0C without it freezing.  Never tried that but I did accidently freeze a beer last night...
363447
this re minds me of a kind of heat called latent heat.this is the heat a subtance requires to change it state without changing it temperature,so water changes from liquid to steam at the same temperatutre if it assumes it latent heat of vapourization.thus water could be liquid at 100*c and also steam at the same temperature.
957050
all things have a solid liquid and gas state. it just depends on the temperature.
650938
Saltwater WILL freeze. The temperature at which it freezes, however, depends on the amount of salt you add to the water. The more salt you add to the water, the lower the freezing point for the solution. You will reach a point when you have added so much salt that the freezing temperature will not decrease anymore.