I think you've just answered your previous question - there are more
than one because its generally more convenient. If you're using
horsepower for power then you should probably be using
horsepower-hours rather than BTUs (which are an admittedly silly
unit for most things).
You have: horsepower hours
You want: btu
* 2544.4336
/ 0.00039301478
>> Finally, Farhenheit units are smaller so that they make more convenient
>> divisions: Eg.
>Bullsh*t. They seem more natural to you because you're more used to
>them. Anyone who hasn't grown up on the system think that Fahrenheit
>is the ultimate in lunacy.
Centigrade/Celcius have little to recomend them either - Kelvin is
the way forward, or Rankine.
Jonathan.
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