Re: [boost] Re: runtime unit-modifiablephysical-quantitiesusingpqs1-00-01

From: Alan Bellingham (alan_at_[hidden])
Date: 2004-01-05 06:41:46

Daniel Frey:

>Wait! I think the above mixes up some important concepts. Look at this:
>
>length     <-> meter
>time       <-> hour
>speed      <-> mph
>frequency  <-> hertz
>
>I hope you see what I mean. 'hertz' is IMHO totally different than 
>length, time or speed.

Only in that frequency is the inverse of period - and is therefore a
1/time unit. 

 length     <-> meter
 time       <-> second
 speed      <-> meters/second
 frequency  <-> /second

When you're doing dimensional analysis, you may multiply a length by a
frequency to get a speed - for example, the wavelength of a particular
radio band times its frequency should give you the speed of light.

Alan
-- 
Alan Bellingham