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metre

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. S

    Basic question - pex or copper for self build 100 sqm metre

    Basic question - pex or copper for self build 100 sqm metre 2 story house. It Is a budget build but will form part of a larger house for years to come. Plan to do some basic plumbing myself, no gas or oil just water pipes. which is a better option and why. Thank you
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  2. O

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  3. M

    Moving soil pipe 1 metre in the below floor construction

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  4. W

    New Main Service Pipe , what to use ?

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  5. I

    Long Kitchen waster run (12metres)

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  6. PriestyUK

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  7. plumb_know

    Waste pipe fall

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  8. N

    Water in two toilets turning brown - Help

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  9. B

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  10. R

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  11. F

    Valiant 837..... my gas metre is racing

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  12. M

    volume per metre of copper pipe

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  13. P

    longest run for horizontal soil is 6 metres, but what about when u add bends

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  14. B

    Adding 3 metres of 28mm pipe at the end of a 15 metre 22mm run

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  15. F

    pre pay gas metre fault??

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  16. M

    Installing dog bath in basement. Waste is 1 metre higher then bath.

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  17. M

    Installing dog bath in basement. Waste is 1 metre higher then bath.

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