Will any pressure below 1 bar work at all? Wont it just suck the air in instead?
Comment on Does different parts of the world use different standards for water pressure similar to voltages?
Macaroni_ninja@lemmy.world 4 days ago
In europe they mostly use Bars as the unit of measurement.
Mostly water pressure is around 1-2 bars as a minimum, but there are still places using different standards, for example the old style gravity-fed UK watersystems with sub 1 bar pressure, but those are not very common anymore.
Most domestic sanitary products in the EU are designed to be used on 1-5 bar pressure.
I read somewhere the domestic water pressure to be between 4-6 bar, however not sure how realistic it is accross the whole EU and also what you got at the mains and what you got when opening the faucet is two different numbers.
Agility0971@lemmy.world 4 days ago
evasive_chimpanzee@lemmy.world 4 days ago
These pressures are all gauge pressure, not absolute pressure. 1 bar gauge pressure would be about 2 bar absolute.
Thorny_Insight@lemm.ee 4 days ago
1 bar is enought to lift water 10 meters up. The pressure gauges reads zero at atmospheric pressure.
Agility0971@lemmy.world 4 days ago
Ahh, relative pressure
Macaroni_ninja@lemmy.world 4 days ago
The gravity systems are in this case not pressurized. They just have a water tank in the loft/airing cupboard and the hight of the tank determines the pressure. 0.1 bar for every 1 meter height. You open the faucet and gravity pushes out the water.
Its a nightmare, I used to live in UK and these systems are barely enough for anything really.
AmidFuror@fedia.io 4 days ago
A bar is 100,000 Pa or 100.000 Pa. Why not use KPa? Why set a separate unit to be 1E+05?
Contravariant@lemmy.world 4 days ago
Because 1 bar is almost atmospheric pressure. Oddly enough I’ve never seen anyone use kPa, weather forecasts often use hPa (instead of mbar) to report atmospheric pressure.
Macaroni_ninja@lemmy.world 4 days ago
No idea what is the story behind it, or if there is a practical reason.