Timeline for Why were the SI base quantities chosen as such?
Current License: CC BY-SA 2.5
7 events
| when toggle format | what | by | license | comment | |
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| Mar 25, 2011 at 2:53 | comment | added | Martin Beckett | @piotr - that was the important goal of SI. Before that when units were based on standards owned by another country any diplomatic incident caused havoc - which is why the US inch was different to the British. The french were trying to get away from traditionla units based on king's bodies but also make science and industry work better. | |
| Nov 19, 2010 at 13:42 | comment | added | user68 | Due to ampere: We define base unit coulomb by electron charge and so we have ampere as a derived one. | |
| Nov 19, 2010 at 13:37 | comment | added | user68 | Due to candela: What about other weavelengths? | |
| Nov 15, 2010 at 8:55 | comment | added | Thomas Themel | About the elementary charge: Why would we need to define it? It exists. "One Ampere is the current caused by a flux of <large number> of electrons per second"? | |
| Nov 11, 2010 at 12:04 | comment | added | Piotr Suwara | My answer is that these two were chosen because they can be easily and unambiguously defined, with the definitions constructed so that these quantities may be reproduced in a lab and always give the same results. | |
| Nov 11, 2010 at 1:00 | comment | added | user172 | You didn't answer the question. You're saying that those SI units are well-defined, and I agree. What I'm asking is why of all possible quantities, those two (current and luminous intensity) were chosen. | |
| Nov 10, 2010 at 1:21 | history | answered | Piotr Suwara | CC BY-SA 2.5 |