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Water (chemical formula H2O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is the name of the liquid state of H2O at standard conditions for temperature and pressure.
A number of natural states of water exist. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor.
Water covers approximately 70.9% of the Earth's surface, mostly in seas and oceans. Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea.
Water plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies is a major source of food for many parts of the world. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating, in industry and homes. Water is an excellent solvent for a wide variety of substances both mineral and organic; as such it is widely used in industrial processes, and in cooking and washing. Water, ice and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating and skiing.

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  1. omendata

    Blocked Cold Water Tank Pipes - Doing my head in for over a year

    Ok I have been dealing with this problem for over a year and finally have to ask for some help as backflushing every 2 weeks or so is getting very tiresome. I live in a 60's flat (3 flats per side of the block so 6 flats in all) with two overhead water tanks in a tankhouse on the flat roof for...
  2. K

    Water Regs course - pointless?

    I just completed the BPEC water regs course and boy do I find it useless. Perhaps course is not the right term as I had about 1 hr of presentation followed by an hour of exam and that was it. It was an open book exam and the page and line on which the answer was found was written underneath each...
  3. G

    Any advice about water CONDITIOERS

    Does anyone out there have experience of a water CONDITIONER - I don't want a water softener installed and I wondered if these really work or just a gimmick? I would appreciate any information/reviews from either owners or plumbers please.
  4. G

    Are ActivFlo water conditioners any good please UK?

    Are ActivFlo water conditioners any good please UK?
  5. C

    Low water pressure in bath mixer tap for shower head?

    Hello - am hoping someone out there can offer some advice... I've been living in a split level 1st & 2nd floor masionette for two months, which was built in the 60's. Heating is provided via combi boiler. Water for kichen is fed straight from the mains supply (both hot and cold), however, we...
  6. S

    Help and advice with regard to possible airlock in hot water system.

    Good evening everyone. I am after some advice with regard to our hot water system before I call out a plumber if necessary. So about 3 times since Easter we have had what looks an airlock. I have done the trick with a mixer tap which seems to fix it eventually, usually left overnight. I am...
  7. T

    Spark coming from water line

    The main water line, which is metal, has a spark/light coming from it that is hot to the touch. This was noticed when we turned on our dryer and other items as well. It would light/heat and then stay on for a short period of time. Obviously we find this very dangerous. Does anyone know what does...
  8. M

    Undersink instanous water heater

    Is there an under sink electric water heater say 10kw. That will work to supply the hot water for a kitchen sink?
  9. A

    What instant water heater should I get?

    Hi. I've taken my immersion heater out and want to replace it with an instant hot water heater. The unit will be placed on a wall at chest height from where the immersion heater control was sited (Horstmann economy 7 quartz) The fuse on the fuse board says it's a 16A. I only need it to heat...
  10. N

    Zanussi dishwasher not taking water

    Hi All, Since yesterday I have a problem with my integrated Zanussi dishwasher. When I turn it on there is no water getting into the dishwasher. The machines keep going on and I am not able to turn it off too. So I had to switch off from the main. Please can you let me know what is the problem...
  11. B

    Hot water flow drops off quickly

    Hi, my name is Alan and I have a puzzle with my hot water supply. I have a condensing boiler which is 6 years old and has been regularly serviced. It is a non-vented system, connected to an indirect hot water tank, as well as the central heating system. During the last 2 or3 weeks I have...
  12. M

    Continuous noise from indirect water cylinder

    I have moved into a house with a Joule Cyclone CY200L indirect cylinder in my loft. Recently it seems to continuously be making a noise, as if it's filling up or heating up, I'm not sure which. The thermostat on the side is set to 55, when I turn it below 50 there is a click and then the noise...
  13. J

    Cold water storage tank setup

    Hi all, My mates recently bought a new old house and has had extensive work done including new bathrooms etc. We've got a few questions about the hot and cold water distribution. The house is supplied by cold water at around 3 bar, so decent enough pressure. The way it's set up at the moment...
  14. L

    Waste Water Drainage Issue

    My dish washer and washing machine are installed next to one another per the attached picture. After using the washing machine waste water per the attached picture fills the bottom of the dishwasher. In the attached picture this the waste water after 2 washing machine loads. Attached is a...
  15. M

    Two isolation valve on the same water pipe

    Hello everybody! I just need professional advice from you guys as i have never seen something like that before. In bathroom under the sink there is two isolation valves, they are about 400 mm above the floor level.Client wants to install vanity unit with basin which will make isolation valves...
  16. E

    Anyone know what is wrong with this Water Heater?

  17. Arelia

    Filter against water hardness?

    Hi there Can I have some advise about a filter against water hardness to be installed in the tap, just in the junction with the shower hose? Thx in advance
  18. H

    How to stop water pouring through grouting

    Hello, I have water coming through the grouting between the bathroom tiles and the floor tiles. It flows at about 1 cupful every 2 hours. It is a small area of around 20cm. It is at the base of the boxed area of a common pipe that runs down the side of our 20 storey block of flats. We are on...
  19. M

    Do I have a faulty water meter ?

    Like to change a faucet, turned water off at street meter. I am still getting water at house
  20. J

    Water heater for Shepherds hut

    Hello lovely people, I've gone and got an LPG water heater for my shepherds hut. It'll be situated in an external lean-to enclosure built on the back of the hut, as it is not a room sealed model. (I wanted to save as much space as poss in the tiny loo/shower room). Before getting a gas safe...