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I am using \documentclass{article} to write an article but I should change its default font size to other standards. How can I change the font size of each title or body underneath of each title? How about some words in the document?

How can I understand that each of commands \small, \Huge, etc is equivalent of what font size?

This what I want to have: I have written the font size in front of each section, also I want to left justify the abstract section.

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  • article knows options 10pt, 11pt, and 12pt. This changes all elements controlled by a font-size switch (headers, footnote ...). You can find the actual pointsize in size10.clo (substitute the 0 with 1 or 2 for 11pt or 12pt respectively). – Johannes_B Nov 28 '14 at 15:49
  • If the fontsize should be changed, a \fontsize{newsize}{baselineskipfaktor}\selectfont could be used – user31729 Nov 28 '14 at 15:59
  • @ChristianHupfer would it change the font of all parts? I want to change them separately since they have different font sizes – user3482383 Nov 28 '14 at 16:15
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    @user3482383: It will change the font size until the next change occurs, unless applied in TeX group. You should provide an example of your request, in order to make better suggestions – user31729 Nov 28 '14 at 16:16
  • I added an answer for the general aspects of your question. Do you have also an example that you want to work out? – Ruben Nov 28 '14 at 16:26
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The fontsize commands of LaTeX, e.g. \small, \large, etc. work in relation to the global fontsize of the document. Hence, they change if the font size of the document changes. For a detailed overview see

What point (pt) font size are \Large etc.?

In concrete they are used like a switch. For example

\documentclass{article}
\usepackage{lipsum}

\begin{document}
%Some normal sized text, no changes
\lipsum[1]

%smaller text from here
\small
\lipsum[2]

%again normal sized
\normalsize
\lipsum[3]
\end{document}

You can of course limit the effect of those macros to a group, i.e. {\small This text is small\par}. In this case text that follows the group won't be affected. (Note the \par concluding the group to apply the correct line spacing.)

Now, you can change the font size of the document globally by declaring the 10pt, 11pt or 12pt option while calling the documentclass as:

\documentclass[11pt]{article}

Regarding your example I used the titlesec package to patch the sectional headings. The customization of the title and the abstract - note that I added a \keywords macro - is hand-crafted. A complete code could be:

\documentclass[11pt]{article}
\usepackage{lipsum}
\usepackage[T1]{fontenc}
  \renewcommand\rmdefault{ptm}
\usepackage{textcase,url,titlesec}

\titleformat{\section}{\relax}
            {\large\BoldAllcaps{\thesection}}{1em}{\large\BoldAllcaps}

\newcommand{\BoldAllcaps}[1]{\MakeTextUppercase{\scshape\bfseries #1}}

\makeatletter
\renewcommand\@maketitle{%
  \newpage
  \null
  \vskip 2em%
  \begin{center}%
  \let \footnote \thanks
    {\Large\bfseries \@title \par}%
    \vskip 1.5em%
    {\large
      \lineskip .5em%
      \begin{tabular}[t]{c}%
        \@author
      \end{tabular}\par}%
    \vskip 1em%
    {\small \@date}%
  \end{center}%
  \par
  \vskip 1.5em}%
\renewenvironment{abstract}{\section*{\abstractname}}{\relax}
\newcommand{\keywords}[1]{\par\vspace{.5em}\noindent{\large\bfseries \keywordsname:} #1\par}
  \def\keywordsname{Keywords}
\makeatletter

\title{Title of paper}
\author{Author}
\date{Affiliation, \url{e@ma.il}}

\begin{document}
\maketitle

\begin{abstract}
  \lipsum[1]
  \keywords{blah, blah}
\end{abstract}

\section*{Introduction}
\lipsum[2]
\end{document}

fontsize_ex

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