XPost: rec.arts.comics.strips   
   From: tkoenig@netcologne.de   
      
   Paul S Person  schrieb:   
   > On Mon, 12 Jan 2026 07:07:43 -0000 (UTC), Thomas Koenig   
   > wrote:   
   >   
   >>Scott Dorsey  schrieb:   
   >>> In article <10k0qgo$3r1s$1@dont-email.me>, BCFD 36     
   wrote:   
   >>>>I have never run across "tons" when talking about cooling. I don't think   
   >>>>it is common. I have seen BTUs, CFM at xxx degrees, etc.   
   >>>   
   >>> It's pretty common for any industrial AC stuff.  Americans also use   
   >>> "BTU" when we mean "BTU/hr" which is almost as bad as the whole   
   >>> "calories meaning kcal" mess.   
   >>   
   >>A good thing these were thrown out (except in the context of   
   >>nutrition, where they still occur).   
   >>   
   >>Having different units for heat and mechanical energy is just   
   >>fundamentally broken, as is having things like Earth's gravity or   
   >>the density of certain liquids such as water or mercury in units   
   >>(except for their historical definition).  Units just need to   
   >>be consistent.   
   >   
   > But ...  but ... but ... consistency is the hobgoblin of small minds.   
      
   Asomov quoted this with regards to spelling of chemicals, or   
   hyphenation of words in a book, I think.   
      
   When a unit conversion error means a wrong result, not really,   
   and if you never know   
      
   >>I remember cracking up once when I read a definition of the   
   >>Reynolds number not as   
   >>   
   >>  Re = u * d * rho / eta   
   >>   
   >>but as   
   >>   
   >>  Re = u * d * rho / (eta * c)   
   >>   
   >>where c was the correction factor for the units, left unspecified,   
   >>of course.  Hilarious!   
   >   
   > I take it eta is some sort of constant whose manipulation can   
   > counteract different units.   
      
   u is the velocity (m/s), d is a typical dimension (m), rho is the   
   density (kg/m^3) and eta the dynamic viscosity (Pa * s).   
      
   If you put in things in inconsistent units, you have put the   
   different units into that constant c.   
      
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