Jan Sammer     560 Riverside Drive   Apartment 3Q   New York, NY 10027

 September 3, 1986          

Dear Dewey:

Re: revisions to chapter 4 of Basic Properties of Matter, “Compressibility.”

As I understand from Ron, the change involves the natural unit of pressure, which has increased by a factor of three, because the mass unit was increased by this same factor. The change in the mass unit affects energy, momentum, pressure, and force. But this increase is compensated for by the fact that pressure is one-dimensional, rather then three-dimensional. Thus the final figures should be close to the ones you calculated on the basis of the old value of the mass unit.


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