Similarly, tin exists under two stable forms, white and gray,

the one above, the other below the transitional point, which
is, in this case, 18 degrees C
Similarly, tin exists under two stable forms, white and gray,
the one above, the other below the transitional point, which
is, in this case, 18 degrees C. At this temperature white tin
is in a metastable condition, and transforms into the gray
variety. The transformation goes on, then, at ordinary
temperatures, but, fortunately for us as users of tin
implements, very slowly. Its velocity can be increased,
however, by lowering the temperature, on which, then, not only
the transformation itself, but its rate depends.


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