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High precission unit conversion constants?

High precission unit conversion constants? - Physics Forum

High precission unit conversion constants? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 05-26-2006, 09:00 PM
PD
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Default High precission unit conversion constants?




Oliver S wrote:


There is no ignition controller on the planet that needs to do anything
better than 9 digit precision. Hell, you don't know the spark gap to
that kind of precision.

Don't confuse computing word lengths with reality.

PD

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  #2  
Old 05-26-2006, 10:08 PM
PD
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Default High precission unit conversion constants?


Oliver S wrote:

There is no way to derive them to better precision. They are not known
to better precision. They are not pure numbers, they are measured
numbers. That is the limit to the precision of the measurement.

Overkill away.

PD

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  #3  
Old 05-27-2006, 02:41 AM
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Default High precission unit conversion constants?

"PD" <[Only registered users see links. ]> wrote in message
news:1148681314.992426.63990@g10g2000cwb.googlegro ups.com...


Yep. Way over the top. Downright silly.


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  #4  
Old 05-27-2006, 02:42 AM
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Default High precission unit conversion constants?

"Oliver S" <[Only registered users see links. ]> wrote:

You don't need such precision. It's all thrown away in so many other
conditions that's it's just crazy to focus on this point.


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  #5  
Old 05-27-2006, 09:08 AM
tadchem
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Default High precission unit conversion constants?


Oliver S wrote:

There are only so many digits that are significant. any more digits
would be insignificant.


Make up your own. Any insiginificant digit is as good as any other,
which is to say it just provides extra computational overhead with no
measurable benefit.

Use all zeroes.

Don't like zeroes? Use all 5's.

Do the results look too contrived?

Pick a chunk out of the middle of the sequence
12345678901234567890123...

Still don't like the look? Go down to your nearest gaming store and
invest in a 10-sided die. Then you can 'roll your own' digits.

Tom Davidson
Richmond, VA

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  #6  
Old 05-28-2006, 01:20 AM
tadchem
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Default High precission unit conversion constants?


inri wrote:


....usually, for those of us who make daily real-world measurements, but
the OP seems to want more than 9 digits.

I used to do 7 digits routinely: certifying what was called 6-nines
helium - 99.9999+% helium. To get that little plus sign we had to
*know* the 7th digit.

Tom Davidson
Richmond, VA

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