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Tue May 21, 2019, 07:06 AM

Weight. WHAT!?! The kilogram has changed

Out with the old kilogram, in with the new -- scientists introduce more accurate measure

The new definition is based on the Planck constant -- a physical constant observed in the natural world -- rather than the precise weight of a piece of metal kept under lock and key.

For more than 100 years Paris has been home to Le Grand K -- or the International Prototype Kilogram, as it is officially known -- a block of metal that previously defined the weight of a kilogram.

The reason for the change to the International System of Measurement (SI) units was that over time the prototype lost atoms and therefore mass because it is "susceptible to damage and environmental factors," according to the National Physical Laboratory (NPL), which houses Kilo 18, Britain's copy of Le Grand K.

Le Grand K was compared with the various copies only once every 40 years, which made the calibration potentially inaccurate. Though the change in mass is roughly equivalent to the weight of an eyelash, the repercussions could be severe.

https://www.cnn.com/2019/05/20/world/new-kilogram-introduced-scli-intl-scn/index.html

17 replies, 1176 views

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Response to underpants (Original post)

Tue May 21, 2019, 07:08 AM

1. So my jeans have shrunk in the wash?

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Response to Solly Mack (Reply #1)

Tue May 21, 2019, 07:29 AM

2. I too have experienced shrinking clothes

You know it's funny, it always happens around the same time the batteries start failing on my scale and it provides a faulty reading. Weird coincidence that

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Response to tymorial (Reply #2)

Tue May 21, 2019, 07:34 AM

3. You let the enemy of the tasty into your home?

For shame!

Fight the power! (remove the batteries)

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Response to Solly Mack (Reply #3)

Tue May 21, 2019, 09:42 AM

11. I wish. I lost 80 pounds about 6 years ago and this past year I have gained 20

I swore that I would never get back to where I was. I am so mad at myself.

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Response to tymorial (Reply #11)

Tue May 21, 2019, 12:59 PM

15. Stop beating yourself up. That never helps. Becomes self-defeating.

Easier said than done, I know.

We can't change what we're not aware of - so you're halfway there already. You're aware.

Helps me anyway.





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Response to Solly Mack (Reply #1)

Tue May 21, 2019, 08:22 AM

9. It's not the washer or dryer

Itís the fridge

The enemy of the tasty

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Response to underpants (Reply #9)

Tue May 21, 2019, 08:32 AM

10. Oh I can't blame the fridge. It's always running.

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Response to underpants (Original post)

Tue May 21, 2019, 07:34 AM

4. I was always told that the French hated Americans, but this is too much.

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Response to 3Hotdogs (Reply #4)

Tue May 21, 2019, 07:37 AM

6. Calm down. Nobody is coming for the pound.

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Response to underpants (Original post)

Tue May 21, 2019, 07:36 AM

5. this is why metrics is whooie. NPR had a good t ing on that tube. its BS i say.

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Response to pansypoo53219 (Reply #5)

Tue May 21, 2019, 07:38 AM

7. Exactly. We should measure gas by how much liquid goes into a cow-skin.

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Response to DetlefK (Reply #7)

Tue May 21, 2019, 07:41 PM

17. only if it holds a gallon.

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Response to underpants (Original post)

Tue May 21, 2019, 07:56 AM

8. The pound is a pound

A pound is still a pound world round.

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Response to zipplewrath (Reply #8)

Tue May 21, 2019, 05:46 PM

16. For over 120 years, the pound has been defined in terms of the kilogram

and in 3 different ways in the US:

In the United States, the avoirdupois pound as a unit of mass has been officially defined in terms of the kilogram since the Mendenhall Order of 1893. That Order defined the pound to be 2.20462 pounds to a kilogram. The following year, this relationship was refined as 2.20462234 pounds to a kilogram, following a determination of the British pound.[21]

In 1959, the United States National Bureau of Standards redefined the pound (avoirdupois) to be exactly equal to 0.453 592 37 kilograms, which had been designated as the International Pound. According to a 1959 NIST publication, the United States 1894 pound differed from the international pound by approximately one part in 10 million.[1] The difference is so insignificant that it can be ignored for almost all practical purposes

https://en.wikipedia.org/wiki/Pound_%28mass%29#In_the_United_States

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Response to underpants (Original post)

Tue May 21, 2019, 09:56 AM

12. Now I need to call metrology

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Response to Johonny (Reply #12)

Tue May 21, 2019, 10:22 AM

13. I'd go with Greg not Steven

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Response to underpants (Original post)

Tue May 21, 2019, 11:51 AM

14. A Kibble Balance would look great in my mad scientist lair.

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