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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. C

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    CAME HOME FRIDAY WATER MUDDY COMING IN, BUT IT CLEARED UP. WOKE UP SATURDAY MORNING TO ONLY A TRICKLE, BUT WATER METER IS RUNNING. UNDER THE HOUSE IS DRY SO FAR. WE HEAR NO RUNNING WATER OR SPEWING. THER ARE NO WET FLOORS, OR MOLD. NO POOLING WATER OR WET SPOTS OUTSIDE. WE DO NOT NO WHERE...
  2. J

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  3. M

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  4. C

    Water Meter Turning Constantly

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  5. philw67

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  6. N

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  7. W

    Meter move to vacant meter position

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  8. M

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  9. M

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  10. G

    Gas meter needs moving

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  11. W

    Convert central heating with 1 meter into separate controls & meters

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  12. F

    Compression onto brass solder meter union

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    • Flipsy
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  13. R

    Help... no gas coming through meter or regulator

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  14. S

    Asking for opinion about flow meter concerto

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  15. A

    Looking for a specific flow meter for UFH manifold

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  16. J

    Move gas meter options

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  17. F

    Gas Pipe Renewal (Lead)-Inlet Entry & Meter Location query

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  18. R

    Is this a correct meter installation?

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  19. C

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  20. M

    Meter bung/caps?

    Hi folks. Where is the best place to get hold of some meter bungs/caps please? I believe they are red plastic. Cheers.
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