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A set of internationally accepted units to aid in communication of measurements.

1
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A couple of issues: So after May 20th, 2019, what exactly will be the defined value of $\hbar$? What will be the defined number of elementary charges in a Coulomb? Then $\mu_0$ and $\epsilon_0$ will …
asked May 2 by robert bristow-johnson
1
vote
the "$t$" in $$ \omega=\frac{2\pi}{t} $$ is the period of oscillation. the time required for one complete rotation of an angular vector. it's not just any old time, but a specific time. it is no …
answered Jun 22 '18 by robert bristow-johnson
23
votes
Temperature Amount of a substance Luminous intensity are pretty much bogus fundamental units. The unit temperature is just an expression of the Boltzmann constant (or you could say the converse, t …
answered Feb 23 '15 by robert bristow-johnson
0
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I just wanna thank rob for pointing me to a root source. One additional click in gets us to: ... effective from 20 May 2019, the International System of Units, the SI, is the system of units i …
answered May 3 by robert bristow-johnson