In a message dated 10/04/2006, ian@........... writes:

When we  buy a quantity of goods, like flour for instance, we put the flour 
on a  weighing machine, which measures the weight but, under the metric system, 
we  quote the weight in units of mass (Kg).  

Now if we buy 10 Kg of  flour in Reykjavik then take it and the measuring 
machine to Panama and  measure out another 10 Kg, we will find that the two 10 Kg 
bags of flour are  different (by a tiny amount). 


Hi Ian,
 
    Only if you use a force balance. If you use balance  scales with weights, 
or a steelyard, you get no variation, because they measure  mass.
 
    Regards,
 
    Chris Chapman






In a message dated 10/04/2006, ian@........... writes:
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  buy a quantity of goods, like flour for instance, we put the flour on a=20
  weighing machine, which measures the weight but, under the metric system,=20=
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  quote the weight in units of mass (Kg).  

Now if we buy 10 Kg=20=
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  flour in Reykjavik then take it and the measuring machine to Panama and=20
  measure out another 10 Kg, we will find that the two 10 Kg bags of flour a=
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  different (by a tiny amount). 

Hi Ian,
 
    Only if you use a force balance. If you use bal=
ance=20
scales with weights, or a steelyard, you get no variation, because they meas=
ure=20
mass.
 
    Regards,
 
    Chris Chapman