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Various changes including better ko-fi badge, new home page etc.

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V.H. Belvadi V.H. Belvadi
V.H. Belvadi authored and V.H. Belvadi committed Apr 24, 2019
1 parent 5be29db commit 039a3b937fda2eaae9322b98c80a51dde5a1221b
@@ -273,13 +273,42 @@ figcaption h4 + p {

.markdown blockquote {
background: #edeff1;
margin: 0 0 1.5em;
padding: 1rem 1.25rem .75rem;
font-size: 0.95em;
border-left: 3px solid #dee2e6;
background: #edeff1;
margin: 0 0 1.5em;
padding: 1rem 1.25rem .75rem;
font-size: 0.95em;
border-left: 3px solid #dee2e6;

@-webkit-keyframes rotate {
from {
-webkit-transform: rotate(0deg);
to {
-webkit-transform: rotate(359deg);

@keyframes rotate {
from {
transform: rotate(0deg);
to {
transform: rotate(359deg);

article img.homeLogo {
min-width: 0;
max-width: 150px;
float: right;
-webkit-animation: rotate 20s infinite linear;
animation: rotate 20s infinite linear;
margin: -0.25em 0 1.5em 0.77em;


.book-git-footer {
font-family: $sans;
@@ -346,6 +375,15 @@ code.has-jax {
font-weight: bold;

.postIt a img {
transition-duration: 1s ease-in-out;

.postIt a:hover img {
transform: scale(1.02);
transition-duration: 1s ease-in-out;

.footnotes .MathJax_Display {
display: inline !important;
@@ -1,50 +1,22 @@
title: Welcome to Physics Capsule
title: Physics Capsule
type: docs
# Welcome to the open-source Physics Capsule project

# Welcome to Physics Capsule
<img src="PhysicsCapsuleGlobeLogo.png" class="homeLogo">

## Physics Capsule as a book
We are on a mission to make academic physics accessible to everyone online and for free. Start learning physics by browsing topics that interest you; or contribute to the project.

Over four years ago we started **Physics Capsule** with an idea that had excited us immensely. It took us these three years, however, to fully shape that idea. On the way we have had guest authors, friendly editors, lots of well-wishers and more people than ever giving us suggestions and ideas. We appreciate all of this and we realise that while our intentions with **Physics Capsule** have undoubtedly changed over the past four years our core purpose is now better defined than ever before.
# For readers
Begin your exciting journey in physics today. Deepen your understanding of the universe; change how you look at the world around you. Read our contents section in order or pick a topic of your choice and jump in.

## Major changes
# For contributors
Writing or developing for Physics Capsule is as easy as forking our Git repository and submitting a pull request. Get started by [reading our Wiki](// which will tell you everything you need to know about this project and the many ways you can contribute to it.

In the briefest sense, **Physics Capsule** has become streamlined over the years. It had the flair of a magazine when it was founded and has the stateliness of a book today. We have decided to completely cut down on reporting current research on a regular basis–we will still do so once in a while when we feel it is necessary, perhaps a couple of times a year. If reportage is what you seek there are other excellent sources out there, most of them magazines.
# For supporters
If you find Physics Capsule useful but are unable to contribute by writing for us, you can also show your appreciation by helping us fund our server, maintenance and publicity costs. You can buy us a cup of coffee (or many cups if you like) anytime and however often you want. [Get started right away.](//

Instead we took the decision to focus our efforts on what we realised was the kernel of **Physics Capsule**, the old *Learn* section. This entire website is now what was a single section before. This benefits us and our readers in two ways. Firstly, saving the extra effort that went into beautifying articles–cover images, credits, legality and what not–means we can focus even more on our content and work towards automating and modernising as much of our presentation as possible.

## Filling a void

Secondly, we have long noticed a downside for people who want to learn physics online–and there are many who do–which is that video content is time-consuming, audio content is incomplete for mathematics, and written content either treats a subject for practising physicists or at the high-school level. What we have always wanted **Physics Capsule** to be is a one-stop solution for anyone who wants to learn physics without being crippled by a lack of mathematical knowledge or having to be handheld and spoon-fed all the way.

Both my friend (and co-founder of this website), Roshan Sawhil, and I believe in Heisenberg’s words: ‘Even for the physicist the description in plain language will be a criterion of the degree of understanding that has been reached’. These are the words of a man who was famously mathematical. What we look for, at the end of the day, is to strike the right balance between verbal physics and mathematical physics.

More important, we want to address the notion of exhaustiveness. Most online resources shine because they connect to the rest of the world. This makes them bottomless wells: promising but somewhat unrealistic. I have myself always strongly believed that the beauty of a book, as opposed to the internet, lies in its finiteness. You can finish a book; you can never completely read the internet–and not for a lack of trying. You would gain little on the way too.

## The online book

What we want **Physics Capsule** to be is a self-contained compendium of knowledge in physics, suitable for all levels of understanding, for people with all sorts of educational backgrounds. At the same time we want it to neither be unrealistic about its capabilities nor be skeuomorphic. We will connect to other sources, but we will prefer chapters and webpages to volumes and websites; and we will embrace the idea of a book without losing the benefits screens and the internet bring with them.

This brings me to our final–and perhaps most obvious–change here: the design. Almost everything the old **Physics Capsule** had is now gone. Almost: the articles are now undeniably front and centre and you need no ‘reader view’ to improve readability here. Equations, $ E = mc^2 $, for example, look great, as do derivations like

\dot{T} &= {\textrm{d}\over\textrm{d}t}\left( {1\over 2}mv^2 \right) \\[.5em]
&= {m\over 2} {\textrm{d} v^2 \over\textrm{d}t} \\[.5em]
\implies \dot{T} &= \mathbf{F} \cdot \mathbf{v}

The design, therefore, maintains harmony between our intentions and our presentations in a way we have never seen before on **Physics Capsule**. Read it at once, [cover to cover](/contents), or pick your [favourite topic](/index), or flip open a [random page](/random). **Physics Capsule** is a book through and through but online, blending the best of both worlds.

## Make it yours

While this new **Physics Capsule**, the second edition, was inspired by books and $ \LaTeX\ $, two things we physicists surround ourselves with, we still wanted it to be *your* book. No two people read alike, so why should one size of **Physics Capsule** fit all? Scroll down to the bottom of any page—including [this](#displayPrefs)—and find our special display preferences toolbar: change the font size and/or choose from among a handcrafted selection of paper styles. Make **Physics Capsule** look like you want it to and only do it once: the next time you drop by we will remember and restore your old settings.

We have always wanted this to be more than just a website; we now have a name for this: an online book, a fast expanding but planned, vast but not exhaustive resource that can help almost anyone learn physics academically.

But not all has changed: we started out with the assurance that we would try to use some form of monetisation but not force advertising on readers–this is still valid. And we believed that this is a platform, now a book, not for one-sided learning but for all of us–teachers and learners–to learn together–this too is still valid. **Physics Capsule** is still the excellent reading material it has always been except it is now more focussed and is a better version of itself by any measure, in more ways than one.
#TableOfContents { display: none }
@@ -1,5 +1,5 @@
<div class="postIt">
<p><span>Physics Capsule</span> is under a GNU GPLv3 license <a href="" target="_blank"><u>(?)</u></a> so our source code is open. You can contribute to this project in any way you like. Contribute by <a href="" target="_blank"><u>forking this project on Github</u></a> or show us your appreciation with a cup of coffee:</p>
<script style="margin-left: auto; margin-right: auto;" type='text/javascript' src=''></script><script type='text/javascript'>kofiwidget2.init('Buy us a coffee', '#46b798', 'Q5Q4UCH2');kofiwidget2.draw();</script>
<p><span>Physics Capsule</span> is under a GNU GPLv3 license <a href="" target="_blank">(<u>?</u>)</a> so our source code is open. You can contribute to this project in any way you like. Start by <a href="" target="_blank"><u>forking this project on Github</u></a> or show us your appreciation with some coffee:</p>
<a href='' target='_blank'><img style='border:0px;width:100%;' src='kofi.png' border='0' alt='Buy Me a Coffee at' /></a>
<p>Read about why we started this project and find contribution guidelines <a href="" target="_blank"><u>on our Wiki</u></a>.</p>
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