Daniel, Paul sirs:
Perhaps OFF topic.
How would one apply the definition when calibrating a metre stick?
http://www.the-light.com/cal/bbv_m-astrounits.doc
Regards,
Brij Bhushan Vij <[EMAIL PROTECTED]>
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From: "Daniel" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: "U.S. Metric Association" <[email protected]>
Subject: [USMA:34909] Re: a prominent ratio in SI
Date: Sun, 16 Oct 2005 12:37:56 -0400
The reciprocal of the speed of light is a quirk of the definition of the
metre. If the definition was reworded such that it appeared as: The speed
of light is defined as light travelling a distance of 299 792 458 m in 1 s,
then the concept of the fraction is eliminated. It is all in the sequence
of wording as to whether the number appears as a whole number or as its
reciprocal. I would think the definitions are commutative (a=b, therefore
b=a)
How would one apply the definition when calibrating a metre stick?
----- Original Message -----
From: Paul Trusten, R.Ph.
To: U.S. Metric Association
Sent: Sunday, 2005-10-16 11:37
Subject: [USMA:34905] a prominent ratio in SI
In the latest SI brochure, French and English versions respectively, the
definition of the meter is stated as follows:
Le mètre est la longueur du trajet parcouru dans le vide par la lumière
pendant une durée de 1/299 792 458 de seconde.
The metre is the length of the path travelled by light in vacuum during
a time interval of 1/299 792 458 of a second.
Thus, the definition of the meter itself does not involve the use of a
negative exponential expression, but as a ratio that we like to call a
fraction.
Paul Trusten, R.Ph.
U.S. Metric Association, Inc.
www.metric.org
Editor, "Metric Today"
3609 Caldera Blvd., Apt. 122
Midland TX 79707-2872 USA
[EMAIL PROTECTED]
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