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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. S

    Bathtub fills up for a bit when running water and then drains normally

    Hi all, I am a newbie DIYer and have a question I was hoping someone might be able to help me with. When we run the water in our bathtub it drains very slowly at the start, as if it is clogged or something, and then after a minute or two it drains normally as if something has been dislodged...
  2. R

    Unsolvable water hammer when shutting taps

    I have read a few threads including one by Debbie Stano that were similar to my issue but that thread stopped a while back without any resolution I could see. I'm in Brisbane, Australia but I'm after general ideas from anyone here or in UK (I realise this is a UK based site). Point form...
  3. X

    How do I fix overflow constantly running on ROS drinking water faucet?

    I have a ROS small faucet for drinking water. The main faucet in the kitchen works find. I recently replaced the main faucet but after reconnecting everything, the overflow on the ROS drinking water faucet will not stop running. The only thing connected to the ROS that I manipulated was an...
  4. M

    Hot water to multiple commercial kitchens

    Hi all, Hope all are well. I’m in the early stages of renovating an industrial unit. The fit out is to have 7/8 commercial kitchens, these kitchens will have reasonable output, i.e. high street takeaway in terms of their demand. The unit has 3 bar of pressure and 25 litres a minute of water...
  5. MichaelO

    Water supply line pressure: one too low, one too high

    Two connected houses in our 70s condo development, everyone served by one water meter at the road. 833 has 40 lbs of pressure while attached house 835 has over 100 lbs. -- no problems in either house or immediately outside -- and no pressure relief valves or shutoffs. Plumber traced the...
  6. J

    Hot water leaking at overflow

    Hi Overflow suddenly spouting out luke warm water to outside of house, checked on down pipe in photo leads exterior overflow, could put finger spout when overflowing and its luke warm water. Why is it overflowing? Lot of water coming out. Photo attached of side of tank to show above. What is...
  7. T

    Water Pipes Vibrating Our Floor

    Hi Everyone, Thanks in advance for your advice... As the title mentions, my issue is with the water pipes of the house causing the floor to vibrate. I have singled out the issue to the joists that the floorboards sit on carrying the vibrations throughout the house. We do not have hot water...
  8. B

    Not hot water in two outlets

    Hi Guys Need to pick your brains if you have a moment. I attended a flat where in one bathroom the hot water on the basin had major low pressure. In the Ensuite shower it was the same issue in the hot water. All the other hot water outlets in the property had good pressure. Bath and kitchen...
  9. M

    installing toilet water valve, hoping for advice

    I have two toilet water valves to install. I'm new to this but have watched enough videos to think I can do it. Both water valves are standard turn off sweat valves that have been soldered on. One has at least two inches of exposed copper pipe extending beyond the wall flange and the other has...
  10. H

    Hot water cylinder only heating top half of tank

    Hiya, we had a new pressurised hot water cylinder fitted a few weeks ago even though its double the size of our last one we are finding we aren't getting any more hot water. So once the tank is full and the immersion has turned off and i touch the tank only the top half feels warm and the bottom...
  11. G

    studio flat heating and hot water

    asked to specify for very small studio flat, architect has drawn a combi boiler, 2 radiators, heated towel rail and shower, basin, kitchen sink, washing machine. seems overkill to me, in the past i have used electric shower, 15l 3kw Ariston for hot water, and electric panel heaters, but he is...
  12. J

    Shower waste water configuration

    Hi I'm currently doing the pre-planning for my next DIY project fitting a shower tray and enclosure from scratch. I'm confident of being able to do the job but not being a plumber not sure the best way to go about it so would appreciate any advice. The current upstairs room has a black waste...
  13. chloeradhsaw

    Baffled By Cylinder Hot Water Draw Whilst Cold Water On

    I had my indirect hot water cylinder removed a few days ago and the central heating boiler and pump is turned off at the fuse spur right next to the boiler. I have been without hot water for a few days which is fine - The plumber left the flow / return to the cylinder uncapped as well as the...
  14. A

    Water pressure reduced when other appliances are on

    Hi all - hoping to get some advice here on a plumbing issue in our house. When we are showering / filling the bath and another appliance draws water (toilet cistern filling after flushing, tap being turned on or washing machine filling etc), the water pressure / flow to the other appliance...
  15. D

    water remains in dishwasher

    I've got a countertop dishwasher. It's an RCA, but it's made in the same place as all the other brands, including Magic Chef, Danby, etc., that have the first generation style design for countertop dishwashers. (the different brands put their own name on these particular identical Chinese...
  16. H

    Water in main street valve

    Just moved into a house and I was going to install a new shower. I went to turn off the water on the street there was water in the drain, should I be concerned about this
  17. B

    Water tank and water query

    Hi everyone, I have a query which I hope I can get advice on. I live on a top floor flat in a block of 6 the water is mains fed in the kitchen and bathroom but the attic has common water tanks which I believe feed the hot water and are cleaned annually. My kitchen has a gas combi boiler...
  18. C

    Water pressure for block of flats

    Hi, I will try to explain best I can, please bare in mind I am currently in a learning stage so just trying to understand the process behind things. A building with three floors and 69 rooms. How do you work out the pressure needed on the hot water system? I’m sure there is a calculation to...
  19. M

    Internal pipe leak - could dripping continue after water turned off?

    I have a growing damp patch on my ceiling, I initially assumed it must be from the empty flat above (and therefore cannot gain access), and have since used emergency cut off for that flat. I'm now wondering if it could a problem in my own flat, so cut a hole in the damp patch to investigate -...
  20. Chris2023

    Will water run through a switched off boiler.

    Long story short I have a leak from possibly the flexi hose that connects to the upstairs hot water tap. I've switched off the boiler and mains water and waiting on a plumber but not sure when they'll arrive. My question is if I leave the boiler off and then turn the water back on so I can use...
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