Changing Font Size when Using Arev

Question

First of all I am new here and am attempting to format this correctly. Please be patient but feel free to critique since I want to learn.

Here is my question: I am using the font Arev but can't seem to set the size by changing the normal \documentclass[]{} command.

\documentclass[10pt]{article}
\usepackage{arev}
\begin{document}

Text Sample
\end{document}

Edit (4/10/17):

There is something else going on here. I tested this in a new document before posting it. After posting it, I tested it without using the arev font. It seems I can't change the font size at all. I'll do some more investigation.

Further edit: It seems like I may just be running into font sizes that aren't supported. I can see changes between 10pt, 11pt, and 12pt but nothing else (I was previously testing with 8pt, 10pt, and 20pt). I looked at the Arev documentation but didn't see any specifications for the supported sizes. So my new question is:

Can I define new scaling to increase support for different font sizes or something similar to this?

Last edit: This was already answered here with extarticle. Thanks!

Answer 1

The size does change but it's not that noticeable. I've added some struts to your example (thank you for providing one):

\documentclass[10pt]{article}
\usepackage{arev}
\begin{document}

\rule{1pt}{2ex}\,\rule{1pt}{12pt}\,\rule{1pt}{11pt}\,\rule{1pt}{10pt} Text Sample
\end{document}

The first strut will vary according to the font size. The other three struts are fixed. Here's an enlarged version of the result:

Now with 11pt:

And with 12pt:

It's more noticeable when switching a much larger size with extarticle:

\documentclass[20pt]{extarticle}
\usepackage{arev}
\begin{document}

\rule{1pt}{2ex}\,\rule{1pt}{12pt}\,\rule{1pt}{11pt}\,\rule{1pt}{10pt} Text Sample
\end{document}

Answer 2

article and extarticle offer only a specific set of fontsize options. If you want to use other size switch to one of the KOMA-classes:

\documentclass[fontsize=21pt]{scrartcl}
\usepackage{arev}
\begin{document}

Text Sample
\end{document}