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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. B

    No Hot Water Unless Heating is On

    Hi, I have an old Bermuda back boiler, and 7 radiators (6 with thermostatic valves, and one that doesn't which is upstairs in the bathroom). There are 3 radiators on the ground floor, and 4 on the first floor. The problem is that I don't get any hot water unless the heating is on at the...
  2. Peter Mago

    How to add water to system- Vaillant Ecotec Pro

    How do I let water into the system? Tap is connected to water tank and there is a black inlet connected to the water tank? Thanks for any answers
  3. P

    Should there be water in trap?

    Good evening, Recently had a slimline shower tray installed, with a 'fast flow waste'. Just today thought id give it a clean, took off the top cover, and removed the little cup thing inside, but there is about id say and inch maybe 2 of water sat in the bottom of the waste unit itself...
  4. T

    No water from the shower

    Just moved into a house as a tree I shower but there is no water coming out of the shower or any sound of water trying to go through the pipes , Have checked the pipes which are in the attic all seem to connected ,any help would be greatful
  5. S

    Sink waste pipe unable to get water tight

    Hi, Noticed a leak in my sink and the pipe collapsed down for the P trap. So I was going to replace it all. However, i've been stuck because this starting part from the sink isn't forming a good water tight seal. The rest of the pipes kind of insert into each other nicel and have a grove in the...
  6. D

    Extending water UFH to attic

    Hi, I have 5 bed house with underfloor heating on all 3 floors.I also have converted attic. UFH was installed in year 2000. I want to put low temp rads in attic (it currently has no heating!) and feed water from UFH on floor below. Question 1: Is this a sensible approach? Question 2: Is this...
  7. mjtefc

    10mm not 15mm cold water to fridge

    Divy here thought his cold water feed was 15mm.. so bought a 15mm - 1/4" reducing tee to plumb a fridge. It's 10mm!! I've already cut it so stuck a stop end on. What options do I have as I can't find a 10mm - 1/4" reducing tee... Do I get some 15mm pipe and use 15mm - 10mm reducers ?
  8. M

    Removing thermostatic valve to clean

    I have a thermostatic concealed shower and would like to remove the thermostatic valve and look to clean any debris as it doesn't appear to be getting very hot, other showers are fine. It's around 6 years old. It was installed by a plumber and bought from a company in Wales, have been told it...
  9. Learning Plumber

    Hot water system plan

    Any experienced plumbers out there kind enough to take a look at my hot water system drawing? You can be critical - I'm learning! It’s designed to supply PV solar preheated water to an electric water heater and then on to small bathroom (daily light use). At the end of an ‘average' day, I...
  10. rowlanda38

    Boiler not heating water

    Hi my boiler has stopped heating the water, the pressure is fine just over 2, plenty of money on gas and my gas hobbs work fine, the water pressure is fine, but as you can see from the video it starts uo then at a certain point cuts out and goes up to 99 then to 00 Any help be appreciated
  11. C

    Boiler flu rain water

    My boiler is in my daughters bedroom and Keeps letting in rain water through the outside flu.
  12. M

    Honeywell ST9400C - Have to put HW & CH on to get hot water

    May parents have a Honeywell ST9400C, when they want to heat up the emersion heater they have to switch the HW & CH on to get hot water. With the CH on as the same time the house gets very hot, just to have a shower! CAn any one advise what can be wrong?
  13. M

    shower toilet seats connected to electricity and water mains

    Hi Has anyone got experience with the below shower bidet seat and does anyone know anyone who could fit this in North Wales region regards
  14. I

    Inline water softners why the massive price difference

    Ok so the APC15 is around £350 and the ones in screwfix Flomaster are about £40........ both i think work on Zinc anodes...... what gives here?
  15. R

    Seitching to Combi boiler. Advice on hot water

    Hi everyone. I'm in the process of deciding if to switch from a traditional boiler to combi. One thing that is irrationally worrying me is if kids leave hot water taps running. Would that mean the boiler (if it was 30kwh boiler) would be running full pelt and using 30kwh gas every hour? Want...
  16. Tomjr98

    Range tribune HE no hot water??

    Ok guys so my Range Tribune He immersion heater stopped giving hot water a couple days ago (I’m a joiner with a limited knowledge in plumbing) also the hot water capacity was never that much it would do 2 showers a day. Any ideas of what’s up with it?
  17. I

    URGENT No hot water - please help

    Hello everyone, I have a glow-worm 24ci which was working fine and has now decided that it doesn't want to heat the water. By this I mean that when the heating is turned on everything kicks in fine but when the tap is turned on nothing happens. Water pressure is fine but doesn't get hot at...
  18. S

    Where is the water pouring and how?

    Hi, under my sink, where the main stopcock is there is a sound of pouring water (started yesterday). There is no sign of a leak anywhere inside or outside and the water meter is not turning. Very confused as the sound is clearly water pouring somewhere but where and how as the meter is not...
  19. N

    Heating and water system

    Hi I am trying to get my system as efficient as possible but am a bit baffled by how my system operates. I have a regular boiler, nest control and an unvented water cylinder. So a few days ago I noticed my boiler had an F1 message and the pressure had dropped so basically I guess it wasn’t on...
  20. J

    Boiler keeps heating despite water being shut off

    Hi! I have an anusual issue with my gas boiler Viessmann Vitodens 100. When I open hot water, the boiler fires up and starts heating the water. However, when I shut the water off, the boiler seems not to understand that there water tap is closed and it just keeps heating till it gets to 90...