Timeline for If the candela is a base SI unit, why isn't the sone an SI unit at all?
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6 events
| when toggle format | what | by | license | comment | |
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| Sep 19, 2016 at 3:58 | comment | added | Jan Bos | @Victor Vibrations in air as a human perceives (i.e. sound) can be calibrated in a similar way to some reference as how a human perceives radiant intensity (i.e. luminous intensity). Or not? The question is why the Candela made it in the SI system and something similar for sound not. | |
| Sep 19, 2016 at 2:55 | comment | added | Victor | yeah, sorry, luminosity, not irradiance. Here you have more information about the topic: quora.com/… physics.stackexchange.com/questions/183210/… | |
| Sep 19, 2016 at 2:48 | comment | added | MaudPieTheRocktorate | Huh? But irradiance is measured in the unit W/m^2 | |
| Sep 19, 2016 at 2:09 | comment | added | Victor | The argument migth that be taking in account the actual methods to calibrate and measurement,the definition of Candela and the other IU gives rises to a set of references that can be use in order to calibrate the measurement devices with the highest precision posible. From that arises the IU system and measurements as sound could be very well calibrated using the definition of kilo, second, meter, and some physical property related to them and sound or pressure. However the best way to measure irradiance is...well, take the definition of Candela and compare your irrandiance with it. That's all | |
| Sep 19, 2016 at 1:03 | comment | added | Jan Bos | What you said about sound can also be said about the Candela. You can express radiant intensity in W per sterradian and square meter just as you can with vibrations of air. However just as with expressing sound in pressure related units it does not tell you the human perception of brightness or sound because it depends on physiological sensitivity of humans. There must be another argument. | |
| Sep 18, 2016 at 20:34 | history | answered | Victor | CC BY-SA 3.0 |