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meter

The metre (Commonwealth spelling) or meter (American spelling; see spelling differences) (from the French unit mètre, from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m.
The metre is currently defined as the length of the path travelled by light in a vacuum in 1/299 792 458 of a second.
The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length.

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  1. Scott_D

    Too much on a U6 meter

    Went to give a quote today on a house with 2 boilers The main house has a Vaillant 938 storage combi and the basement 'flat' has a 24kw combi There were 2 gas meters but when the owner bought the house, they knocked through to the basement flat and had one meter removed so not to pay charges for...
  2. J

    Gas meter

    Anybody come across a metrix G4 pulse meter?
  3. stani

    Smart meter. Or, not so smart meter

    Has anyone had a problem where the meter has shut down and then no gas released. My parents rang yesterday heating not working or gas fire, they are under contract, so engineer came out, thought is was governor, (sensible) asked for National Grid who came out but were unable to change meter...
  4. hammers4spanner

    card meter

    Had a landlord phone me saying tenant is complaining of cost of gas saying 40 quid a week and its only on hour or two a night. Gonna check for gas leaks etc first but also wandering as they are on card meter can these things go faulty ?
  5. U

    Does the diameter of pipe going to the boiler make a difference?

    Hi I'm using an excessive amount of gas, an engineer who replaced my meter told me that the cause of the problem might be the fact that there is a 15mm pipe going to the boiler from the meter when there aught to be a 22mm one. However my landlord's gas engineer claims that this would make no...
    • Unregistered
    • Thread
    • boiler diameter difference engineer going meter oil pipe please
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  6. M

    Accused of stealing cash!!!

    Well there's a first for everything but today and up to me writing this I am being accused by a customer of stealing cash. Serves me right coz when I turned up to the job I should have turned away-really run down Caribbean takeaway. so he asks me to cap a gas pipe. Simple..I ask him where's...
  7. Hobo128

    E6 gas meter

    At a job which is having major work done. I'm moving the boiler and the gas meter is being moved too. I need to remove the gas meter tonight and put it somewhere safe. With it being a e6 meter I'm wondering if there is a limit of time that it can be disconnected for or will it throw up any kind...
  8. T

    Leaking pressure relief valve by water meter.

    Hi all, I've got a dripping pressure relief valve on the very odd plumbing by my water meter - the setup looks like this: The cold water comes in from the mains through the large blue valve to the water meter, through the pressure gauge which reads about 3.5 bar then hits the 6 bar pressure...
    • TheGribble
    • Thread
    • leaking meter pressure pressure relief valve relief valve water water meter
    • Replies: 12
    • Forum: Plumbing Jobs | The Job-board
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