Comments by "Zach B" (@zachb1706) on "How We're Redefining the kg" video.

  1.  @Shakespeare1623  0:38 "The spread has grown to 50 micrograms, or 50 parts per billion" The masses weigh 1 kg (1 billion micrograms), and have diverged by 50 micrograms. That's why he says 50 parts per billion. Yes, 1 microgram is a millionth of a gram, but he wasn't talking about things that weigh 1 gram.
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  2. The pound is defined in terms of the kg.
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  3. A microgram is 1 billionth of a kg
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  4. Doing these calculations anywhere in the world will give the same result (to a tiny degree of inaccuracy)
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  5. The volume of water is not constant, it varies depending on temperature, impurities, and the type of water
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  6.  @Shakespeare1623  yeah but the mass standards have a weight of 1kg. They all diverged by 50 micrograms, meaning they all diverged by 50 parts per billion
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  7. kg is the standard
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  8. The reason g is calculated is so it can be substituted out.
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