guess I'll have to start...
MEANWHILE, IN CAVEMANMERICA:
"how much measure this"
"dunno, use feet"
"too big for feet, use house yard"
Imperial measurements are all officially defined against the metric master race so this affects them too :v
For example, the pound is defined as exactly 0.45359237 kilograms
https://files.facepunch.com/forum/upload/1977/997f2845-815f-4d00-a115-f227ba4066d1/image.png
Hey! We use metric... for drugs, but we still use it!
thats not the point
the point is that whenever the world has to travel to a place that uses imperial units, they need to grab the converters because the country wants to be an old man that measures things using his feet while yelling things and drinking beer
so does this actually affect any equations or is it merely just saying "here's the 'equation' for the kilogram rather than uh.. checking up this hunk of mass"
Pretty much. It just moves the definition from the physical object that has the ability to chance over time to a guaranteed constant.
Veritasium did a video on this subject in 2017.
https://www.youtube.com/watch?v=Oo0jm1PPRuo
The IPK and its replicas have varied in mass since they were made, presumably due to contamination or damage from handling. The reason for the redefinition is to get rid of this variability, allowing (in principle) anyone to produce a 1 kg mass anywhere in the universe.
It was also defined as an exact number of Silicon-28 atoms in a sphere. Using the Watt/Kibble Balance and the sphere checks/balances against each other so now your have both an exact concept of the number of Silicon-28 atoms to define 1kg (which fixes Avagadro's constant) while comparing it to planck's constant/speed of light which both are already known to high precision.
https://www.youtube.com/watch?v=ZMByI4s-D-Y
The mole definition is dependant on the kg, in the course of redefining a gram they affect couple others as well
Another Veritasium vid that explains it
https://www.youtube.com/watch?v=c_e1wITe_ig
If you follow an earth cake recipe on mars, you end up with a really big cake.
And with a bunch of really dead astronauts who took their helmets off to eat the cake.
Shit, they've found an env_cubemap entity
fuck I have to toss out my NIST weights now.
I'm too dumb to be in this thread.
Weight, don't leave
The old definition is dependent on the kg, the new one is not.
I decided my new life goal is to be the guy that, the moment the new definition takes effect, takes the International Prototype Kilogram and yeets it into the sea.
So... what are they gonna do with the old kilogram? Museum? Raffle? Melt it down into a commemorative plaque?
The Ancient Aliens guys are gonna have a fuckin field day with that one.
There are a few dozen copies of the IPK distributed around the world so that's a lot of yeeting to look forward to.
The original IPK is the important one. Someone else can yeet the copies if they want.
This is amazing. I'd love to see the instruments they built and used in person.
Since it's no longer needed to formally define the kilogram itself, they took a second vote to decide what should happen to the IPK, and the conclusion was that it should be yeeted into the sea
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