|
![](/i/fill.gif) |
clipka <ano### [at] anonymous org> wrote:
> Well, obviously it cannot change units of measurements: Those are
> /defined/. What it /can/ change is (a) practical realizations of
> measurements, and (b) possibly the value of natural "constants" as
> expressed in these units of measurement.
I don't think that's the case, given that units of measurements (at least
in the SI system) are defined by natural constants, not the other way around.
--
- Warp
Post a reply to this message
|
![](/i/fill.gif) |
|
![](/i/fill.gif) |
On 10/13/2009 12:59 PM, Warp wrote:
> As far as I have understood, explanation #1 is a misconception. Distances
> between subatomic particles is not growing because the forces keeping atoms
> and molecules together is way stronger than any minuscule drift that the
> expansion of the universe might cause.
The gravitational force of the sun is also "way stronger" than the
gravitational force of the Hubble telescope. That doesn't mean it has
zero effect on us sitting here in front of our computers. :)
-Mike
Post a reply to this message
|
![](/i/fill.gif) |
|
![](/i/fill.gif) |
Warp schrieb:
> clipka <ano### [at] anonymous org> wrote:
>> Well, obviously it cannot change units of measurements: Those are
>> /defined/. What it /can/ change is (a) practical realizations of
>> measurements, and (b) possibly the value of natural "constants" as
>> expressed in these units of measurement.
>
> I don't think that's the case, given that units of measurements (at least
> in the SI system) are defined by natural constants, not the other way around.
Well, that's actually far from the truth. For instance, the
gravitational constant is nowhere to be found in the SI system, nor is
the planck mass, electron charge etc.
As a matter of fact, the only /fundamental/ natural constant presently
used in the SI system is the speed of light; all other SI units are
based on physical properties that are only indirectly affected by
natural constants.
And no, units of measurement cannot change /by definition/, because it's
by them that we measure the properties of the world, including natural
constants.
This is counter-intuitive to what any sane person would think (which is
why you're disputing it I guess) - but who said that scientists are sane
in the first place?
Post a reply to this message
|
![](/i/fill.gif) |