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errr what is a Kilogram

pierre_pierre
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errr what is a Kilogram

http://www.bbc.co.uk/news/science-environment-12276822
As scandals go, it's a subtle one. What Professor Phillips and a room full of those concerned with the measurement of things - metrologists, as they're known - are at this Royal Society discussion meeting to hash out is the ongoing scandal of the kilogram.
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Re: errr what is a Kilogram

All to do with not measuring it in absolute terms. They need to measure its mass in relation to something fixed, like the mass of an atom of something known and invariable.
pierre_pierre
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Re: errr what is a Kilogram

finks that wot was sed
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Re: errr what is a Kilogram

perhaps tom and dc & nc should get inside their tt and see if it is indeed a conservative plot to gain more taxes, by making the cutting the kilogram down a bit, they will be able to gain more revenue from increased sales (remember vat went up to 20%) and just after the last war, when the conservatives were in power, they were quite happy to have "Purchase Tax"  (forerunner of vat) at 25%....
Looking forward to what tom and tt have to say about it all... Smiley
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Re: errr what is a Kilogram

It can be specified in moles ... look up Avogadro's Constant.
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Community Veteran
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Re: errr what is a Kilogram

Speaking as a metrologist - this isn't new.  Any physical standard will change with time, and even definitions based on a "constant" aren't fixed.  The metre is defined by the distance travelled by light in a fixed period of time, and now they've discovered that light is slowing down!
The International Standard Kilogram is the lump of platinum kept in the basement of the Louvre (a room that technically and legally belongs to no country) in a hermetically sealed jar.  It's a long way from the original definition of the yard (the distance from King John's nose to the tip of his outstretched finger)
John
pierre_pierre
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Re: errr what is a Kilogram

there I was a digging this  so big and sort of round, found this = how many in a kilo:
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Re: errr what is a Kilogram

Haha, wrong kind of mole.
pierre_pierre
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Re: errr what is a Kilogram

well it is my thread. and I have been using Metric for a long time I have still got my book on the MKS system
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Re: errr what is a Kilogram

Quote from: pierre_pierre
= how many in a kilo:

The number will vary, it depends on how they were cooked.
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johpal
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Re: errr what is a Kilogram

Quote
It can be specified in moles ... look up Avogadro's Constant.

Allow me to introduce johpal's variable constant ...  Cheesy
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Re: errr what is a Kilogram

Quote from: godsell4
... look up Avogadro's Constant.

How did pears get into it Cheesy
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