Timeline for units and nature
Current License: CC BY-SA 3.0
19 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 25, 2017 at 16:01 | history | edited | Emilio Pisanty | CC BY-SA 3.0 |
added 16 characters in body; edited tags
|
| Sep 6, 2016 at 9:25 | vote | accept | hpekristiansen | ||
| Feb 9, 2012 at 19:29 | answer | added | Steve Byrnes | timeline score: 5 | |
| Feb 9, 2012 at 4:17 | comment | added | Manishearth | @SteveB The candela is only used to measure human perception (so not fundamental). Temperature, on the other hand, has a meaning and a use. | |
| Feb 9, 2012 at 3:19 | answer | added | Mark Beadles | timeline score: 11 | |
| Feb 9, 2012 at 1:35 | answer | added | Manishearth | timeline score: 2 | |
| Feb 8, 2012 at 19:58 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
retagged; tried to improve grammar;
|
| Jan 27, 2012 at 4:15 | comment | added | Johannes | Hans-Peter, you might want to check this blog: science20.com/hammock_physicist/physical_reality_less_more | |
| Jan 27, 2012 at 1:59 | comment | added | Steve Byrnes | Can you explain why you're not counting candela? It seems to me that if you count temperature as being different from energy, you should equally well count candela as being different from power. Likewise, do you count becquerel , or is it "the same" as hertz? | |
| Nov 30, 2011 at 4:46 | comment | added | hpekristiansen | I do not arrive at any number - that is what I am asking for. The number five is just the five units from the natural units - length, time, mass, electric charge and temperature. | |
| Nov 29, 2011 at 20:23 | history | tweeted | twitter.com/#!/StackPhysics/status/141613175849234432 | ||
| Nov 28, 2011 at 19:43 | comment | added | Johannes | Hans-Peter, can you elaborate how you arrive at five physical dimensions? I count three: e.g. length, time and mass. | |
| Nov 28, 2011 at 16:54 | comment | added | Ron Maimon | The number of free units is determined by the number of ignorable fundamental constants in your day-to-day life. In our case, it's basically three, because we live in the nonrelativistic non-quantum weak-gravitational regime. The number of units is not a property of nature, but of our position in it. | |
| Nov 28, 2011 at 15:08 | comment | added | hpekristiansen | Notice that my question is about dimensionallity, and not about the units themselves - I do not care weather they are based on universal physical constants, or man made artifacts. | |
| Nov 28, 2011 at 14:47 | comment | added | hpekristiansen | By the natural unit system, I mean e.g. units for length, time, mass, electric charge, and temperature(or and other linear independent units spanning the same space). en.wikipedia.org/wiki/Natural_units | |
| Nov 28, 2011 at 11:03 | answer | added | Helder Velez | timeline score: -2 | |
| Nov 28, 2011 at 7:17 | answer | added | Ron Maimon | timeline score: 7 | |
| Nov 28, 2011 at 3:19 | comment | added | dmckee --- ex-moderator kitten | Maybe you should say what you mean by "natural unit system", since to me that means $c = \hbar = 1$ like Richard Feynman intended. | |
| Nov 28, 2011 at 3:02 | history | asked | hpekristiansen | CC BY-SA 3.0 |