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What exactly is a kg?
by edgyquant 3y ago
What exactly is a kg?
- MOARDONGZPLZ 3y agoBasically 1,000 grams.
- edgyquant 3y agoWhat is a gram?
- ForOldHack 3y agoA gram is the division of a standard Kilogram (Kg ) into 1000 divisions. It's a poor description to both be circular about it, but the Kg is the standard measure of mass. Look to The definition of the standard kilogram. "Since the revision of the SI on 20 May 2019, we can now compare the gravitational force on an object with an electromagnetic force using a Kibble balance. This allows the kilogram to be defined in term of a fixed numerical value of the Planck constant, a constant which will not change over time." "A Kibble balance is an electromechanical measuring instrument that measures the weight of a test object very precisely by the electric current and voltage needed to produce a compensating force. It is a metrological instrument that can realize the definition of the kilogram unit of mass based on fundamental constants." "One important reason for the change is that Big K is not constant. It has lost around 50 micrograms (about the mass of an eyelash) since it was created. But, frustratingly, when Big K loses mass, it's still exactly one kilogram, per the current definition. When Big K changes, everything else has to adjust."
- kibwen 3y agoBasically 1 gram.
- bbojan 3y ago1/12th of the weight of 6.02214076×10^20 carbon 12 atoms.
- gumby 3y agoI think you mean that 1000 grammes is precisely a kg, the weight of which fluctuates a bit, not that anyone can do anything about it.
- IanCal 3y ago> the weight of which fluctuates a bit, Not sure if this is a joke about weights changing over time or in different places due to gravitational differences - but if you mean mass that was true until fairly recently, the kg is no longer defined by the mass of a specific physical item.
- Uehreka 3y ago(Pulls off edgyquant’s mask) Sorry Derek from Veritasium, you’re only getting one video linked in this thread.
- gumby 3y agoUh-huh, precisely, in Paris.