Finally, we have equations that describe an experimentally established
correlation; such relations are generally not meant to provide much
understanding. Ideally, the equation should include a measure of
uncertainty, often a standard deviation, such as
y¼ 6 : 1 1 : 7 x^2 + 0 : 5 ;for 0<x< 1 : 5Some mathematical symbols are given in Appendix A.3.
You may want toderive a predictive equation yourself, as is often
desirable in research, or even during study. One should always perform
some checks on the correctness of the equation. An important check is
whether it is dimensionally correct: Is the dimension on either side of the
equal sign identical.
Note It is often easier to use the SI units for quantities (m, kg, s,
etc.) rather than their true dimensions (L, M, T, etc.).Furthermore, check whether the sign is correct. Calculate some results for
cases where you know or can guess what the outcome should be. For
instance, consider what the result is if a certain variable equals zero.
1.2.5 Some Practical Points
Nearly all rules of basic physicochemical theory are generally
accepted, but this does not hold for the application of the theory
to food systems and processes. The author has refrained from
discussing such disagreements and has merely given what he feels is
the best explanation. In a few cases, differences of opinion have
been mentioned.
Definition of terms: in the subject index, a page number printed in
bold indicates where a term is defined.
The text contains some Notes. These are interesting aspects or facts
that are not part of the main treatment.
Throughout, SI units will be used, unless stated otherwise; see
Appendix A.5. The SI rules for notation are also followed; see
Appendix A.4. A short table of conversion factors is given in
Appendix A.6.
Fundamental constants are discussed in the text and are tabulated in
Appendix A.11.
After the number of some equations an asterisk (*) is added. This
means that it is worthwhile to memorize this equation.
Each chapter (except this one) ends with a Recapitulation. It may
serve to help the reader in rehearsing the main points made in the