Consistently use quotes inside inline code for units

chapters/unitexpressions.tex

@@ -12,9 +12,9 @@ \chapter{Unit Expressions}\doublelabel{unit-expressions}
 
 Note that this document uses the American spelling meter, whereas the SI specification from BIPM uses the British spelling metre.
 
-Examples for the syntax of unit expressions used in Modelica: "\lstinline!N.m!",
-"\lstinline!kg.m/s2!", "\lstinline!kg.m.s-2!" "\lstinline!1/rad!", 
-"\lstinline!mm/s!".
+Examples for the syntax of unit expressions used in Modelica: \lstinline!"N.m"!,
+\lstinline!"kg.m/s2"!, \lstinline!"kg.m.s-2"! \lstinline!"1/rad"!, 
+\lstinline!"mm/s"!.
 
 \section{The Syntax of Unit Expressions}\doublelabel{the-syntax-of-unit-expressions}
 \begin{lstlisting}[language=grammar]
@@ -28,12 +28,12 @@ \section{The Syntax of Unit Expressions}\doublelabel{the-syntax-of-unit-expressi
    unit_factor | "(" unit_expression ")"
 \end{lstlisting}
 
-The unit of measure of a dimension free quantity is denoted by "1". The
+The unit of measure of a dimension free quantity is denoted by \lstinline!"1"!. The
 SI standard does not define any precedence between multiplications and
 divisions. The SI recommendation is to have at most one division, where
-the expression to the right of "\lstinline!/!" either contains no multiplications or
+the expression to the right of \lstinline!/! either contains no multiplications or
 is enclosed within parentheses, or use negative
-exponents, for example, "\lstinline!J/(kg.K)!" may be written as "\lstinline!J.kg-1.K-1!".
+exponents, for example, \lstinline!"J/(kg.K)"! may be written as \lstinline!"J.kg-1.K-1"!.
 
 \begin{lstlisting}[language=grammar]
 unit_factors:
@@ -44,13 +44,12 @@ \section{The Syntax of Unit Expressions}\doublelabel{the-syntax-of-unit-expressi
 \end{lstlisting}
 
 The SI standard specifies that a multiplication operator symbol is written as space 
-or as a dot. For example, Modelica does not support "\lstinline!Nm!" for
-newton-meter, 
-but requires it to written as "\lstinline!N.m!". 
-
-The SI standard requires that this "dot" is a bit above the base line: "·", which is not part of ASCII. 
+or as a dot. The SI standard requires that this "dot" is a bit above the base line: "·", which is not part of ASCII. 
 The ISO standard also prefers "·", but Modelica supports the ISO alternative ".", which is an ordinary "dot" on the base line.
 
+For example, Modelica does not support \lstinline!"Nm"! for newton-meter, 
+but requires it to written as \lstinline!"N.m"!. 
+
 \begin{lstlisting}[language=grammar]
 unit_factor:
   unit_operand [ unit_exponent ]
@@ -77,13 +76,13 @@ \section{The Syntax of Unit Expressions}\doublelabel{the-syntax-of-unit-expressi
 Modelica should know the basic and derived units of the SI system. It is
 possible to support user defined unit symbols. In the base version Greek
 letters is not supported, but full names must then be written, for
-example "\lstinline!Ohm!".
+example \lstinline!"Ohm"!.
 
 A \lstinline!unit_operand! should first be interpreted as a \lstinline!unit_symbol! and only
 if not successful the second alternative assuming a prefixed operand
 should be exploited. There must be no spacing between the \lstinline!unit_symbol!
 and a possible \lstinline!unit_prefix!. The values of the prefixes are according to
-the ISO standard. The letter "u" is used as a symbol for the prefix
+the ISO standard. The letter \lstinline!u! is used as a symbol for the prefix
 micro.
 
 \begin{nonnormative}
@@ -92,15 +91,15 @@ \section{The Syntax of Unit Expressions}\doublelabel{the-syntax-of-unit-expressi
 
 \section{Examples}\doublelabel{examples2}
 
-The unit expression "\lstinline!m!" means meter and not milli
+The unit expression \lstinline!"m"! means meter and not milli
 (10\textsuperscript{-3}), since prefixes cannot be used in isolation.
-For millimeter use "\lstinline!mm!" and for square meter, m\textsuperscript{2}, write
-"\lstinline!m2!".
+For millimeter use \lstinline!"mm"! and for square meter, m\textsuperscript{2}, write
+\lstinline!"m2"!.
 
-The expression "\lstinline!mm2!" means \lstinline!mm2! = (10\textsuperscript{-3}m)2 =
+The expression \lstinline!"mm2"! means \lstinline!mm2! = (10\textsuperscript{-3}m)2 =
 10\textsuperscript{-6}m\textsuperscript{2}. Note that exponentiation
 includes the prefix.
 
-The unit expression "\lstinline!T!" means tesla, but note that the letter "\lstinline!T!" is
+The unit expression \lstinline!"T"! means tesla, but note that the letter \lstinline!T! is
 also the symbol for the prefix \lstinline!tera! which has a multiplier value of
 10\textsuperscript{12}.