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This new edition has been updated and includes a discussion of information theory and descriptions of CT scan, endoscopy, MRI and fMRI imaging, techniques that were not available at the writing of the earlier editions. A word about units. Most physics and chemistry textbooks now use the MKS International System of units (SI). In practice, however, a variety of units continues to be in use. For example, in the SI system, pressure is expressed in units of pascal (kg/m2). Both in common use and in the scientific literature one often finds pressure also expressed in units of dynes/cm2, Torr (mm Hg), psi, and atm. In this book I have used mostly SI units. However, other units have also been used when common usage so dictated. In those cases conversion factors have been provided either within the text or in
a compilation at the end of Appendix A..


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