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fluid

In physics, a fluid is a liquid, gas, or other material that continuously deforms (flows) under an applied shear stress, or external force. They have zero shear modulus, or, in simpler terms, are substances which cannot resist any shear force applied to them.
Although the term fluid generally includes both the liquid and gas phases, its definition varies among branches of science. Definitions of solid vary as well, and depending on field, some substances can be both fluid and solid. Viscoelastic fluids like Silly Putty appear to behave similar to a solid when a sudden force is applied. Also substances with a very high viscosity such as pitch appear to behave like a solid (see pitch drop experiment). In particle physics, the concept is extended to include fluidic matters other than liquids or gases. A fluid in medicine or biology refers any liquid constituent of the body (body fluid), whereas "liquid" is not used in this sense. Sometimes liquids given for fluid replacement, either by drinking or by injection, are also called fluids (e.g. "drink plenty of fluids"). In hydraulics, fluid is a term which refers to liquids with certain properties, and is broader than (hydraulic) oils.

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  1. B

    Solar Thermal Fluid Leak

    Hello My solar thermal system appears to be leaking fluid (pics attached). Could anyone give me an indication of what the issue is likely to be and the potential cost to rectify? The system was installed in May 2021 and has a flat plate panel on the roof. It works very well generally and...
  2. P

    leak detection fluid - respirator to use this stuff?

    Hi, Been meaning to ask this for a while now. Commercial leak detection fluid - the stuff in the hand-pump action spray bottle - it makes me cough and I feel a choking sensation at the back of my throat every time I use it. I keep well away from the thing I'm spraying, but I still get the...
  3. A

    Fluidmaster siphon not working?

    So I’m called out to fix a toilet that isn’t flushing. It is a concealed cistern within a box. When you press the button, the flapper comes up a tad without flushing. The outlet of water then pushes the flapper right up and does not sit back down again, so continuously flows into the pan...
  4. B

    Best power flush fluid?

    Hi guys! I've just purchased a power flush pump system. And would like some advice on what is the best fluid to use for badly clogged systems that have limescale , and where to buy it from. Thanks in advance guys!
  5. M

    Best leak detection fluid?

    What do people find is the best leak detection fluid on the market?
  6. eagleeye

    Which fluid

    Went to look at this job for a new install of an electric boiler. Been told another company has said it is oil in the underfloor heating system. Please let me know your thoughts
  7. E

    u gauge fluid

    hi does anyone know if you can use monument fluid or any other in all monument u gauges? Thanks in advance Eddie
  8. jaydebruyne

    Fluid master Push button siphons

    Beware when you buy the white boxed fluid masters as they've supplied a load with the seal washer missing so the siphon just let's by. Found out after fitting one and having to go back to plumb center for a replacement and costing me an hour of my life!!!!! Just a heads up..
  9. B

    fluid master

    was caught out the other wk stripped a cistern and fitted as I always do fluidmaster kit float and flush assy refitted cistern and screwed and sealed to wall - come to fit push button and the hole in the lid was to big the button just went through ended up making a washer from an old basin waste...
  10. S

    Is there a leak sealing fluid for thermal solar?

    As title guys n gals, been to a job today and customer asked me to look at some weeping compression fittings. Will fernox f4 be suitable? thanks
  11. R

    Fluid master - click seal tap connector

    Anyone use them? £2.99 in selco Guaranteed no leak??!!! Rct
  12. B

    Fluid master pro 45b

    Fitted a liads of these now but the last few I fitted don't seem to shut off fully .fitted valve today and when float rises to level valve shuts off flow but I can still hear a slight hiss ,it could not have been on a worse cistern -built in and poor access anyone else had problems
  13. K

    Fluid leaking from back of gas fire

    Hello, a few days ago I noticed there are two trails of orangey-brown fluid coming from the back of the gas fire. I just wondered if anyone knows what it is, what needs to be done, and does it mean the fire is unsafe to use if it is leaking this stuff? Thank u! :)
  14. B

    fluid for you ugauge...REGU45 AND REGU40

    I just bought 5ml for £8....did a bit of searching and found this if anyone is interested: Manometer Fluid - Various Specific Gravities - Blue and Red has a SG (specific gravity) of 1.88 which is for model REGU35 AND REGU40
  15. C

    How accurate is a hot water cylinder thermostat?

    I am looking for a way to keep a tank of fluid at an reasonably constant temperature. How accurate are the hot water cylinder thermostats? I'm thinking of wiring two up to to control a narrow heating range. The field I'm heating needs to be at around 96c but if it goes over 100c it will...
    • Chris123
    • Thread
    • accurate control cylinder fluid heating hot hot water hot water cylinder thermostat water
    • Replies: 24
    • Forum: Plumbing Jobs | The Job-board
  16. G

    Shower drain question

    Hi, First time poster and pretty handless at DIY. My shower is constantly blocked and I've attempted to use One Stop Drain unblocker. This has been pretty good in the past for normal sinks and toilets. Usually works within minutes. However, when I use it with my shower drain the drain...
  17. B

    Regin 45 premier fluid refill

    hi all, i've got the regin 45 premier gauge and for some reason, i cannot zero it. seems like i've lost some fluid but i don't know how... i'll obviously need to buy refill. does anyone know how to refill? do i unscrew the black screw on bottom left? Thank you. :biggrin:
  18. R

    Fluid master toilet siphon

    Friends, A stupid question I think!! The fluid master toilet siphons that twist off at the bottom, I believe they can be changed, I. E. The body renewed without taking the toilet apart and taking the bottom piece off? I think they also fit the Nubis? Thanks RCT
  19. A

    Regin Premier

    Hi all, I have a Regin premier u gauge but have not yet got any blue fluid for it. Has anyone ever tried using water in them or is it best to stick with the fluid? I know some say its the same S.G but wasn't sure how reliable it is... Cheers.
  20. K

    How long leaving F3 Fernox

    Cant find anywhere this: If you leave cleaner in a central heating system for over 2 months, will it be causing damage? I always thought it would. I thought it was acidic but ive found out its alkali so wont eat at any metal Any1 know the answer?
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