I have a habit of calling it lead tin solder and getting the ratio
backwards.
I recalled that the ratios of lead and tin atoms had to be an integer to
for the lowest melting point.
Other wise you would have a mix of alloys some regions with extra atom of
one of the materials or the other.
Not having an integer ratio of atoms broadens the temperature region
between the solid and liquid states.
On a microscopic scale some areas would be liquid and others would still be
solid. With a perfect ratio
of atoms and properly mixed and alloyed you get a clean transition between
the solid and liquid states.
The ideal ratio is 3. I quickly did my math and came up with the wrong result.
The ratio of atoms with the rounded off 63/37 is 2.971948.
sorry for the error.
73
Bill wa4lav
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