I never talked to anyone in real life about it before yesterday, and even though it was really, really difficult, I'm glad that I pulled through.

I had a meeting with a nurse and a doctor at the psychiatric wing of a hospital, but for other reasons - I have a lot of mental health issues so I keep in touch with them in case I have a breakdown or whatever. That way I won't spiral completely out of control; they can catch me. So anyway, after meeting with said nurse and doctor which was a rather quick meeting, I asked my nurse (who is sorta my contact there) if she had a moment for a one-on-one conversation. She thankfully did and we went to her office. I was pretty anxious all along and once we sat down, I could barely even speak because I kept losing my composure, and my voice was super shaky and I nearly cried.

But I managed to get through it, and told her how I'd seen a short film a couple of days ago that made me burst into tears. How I'd been questioning for years at this point, how I'd always felt out of place and like I was the odd one out. How maybe it's all sorts of things, but perhaps it's because I'm trans.

Not to sound arrogant or anything, but I'm really proud of myself for having the guts to do it. I wouldn't have been able to do that just one year ago. She did say that I was cool/tough for being able to say it out loud and honestly she was the best about it! No judging, no nonsense, no crap. She said all the right things and was really empathetic and understanding despite not at all being qualified for this kind of thing.

So basically what came out of it is that it really felt good to talk to someone face to face. She said she didn't know what to do, but she knew how to find out - which is of course all that I could ask! She's gonna get in touch with a different hospital that has a sexology department (don't know if that's a thing in other countries, I don't know the English name for it sorry). And then she's gonna call me on Monday with her findings!

I still don't know if I'm trans though. I feel like I might be, considering the way I could barely even speak when talking about it out loud. But maybe I'm non-binary too - that's why I'm hoping to get to talk to someone from the sexology clinic. Perhaps they know what questions to ask... I'm also moving in two weeks and I have two exams in that very same week, within 24 hours of one another. But the number one thing on my mind is the above... I think that's pretty telling.

Thank you for reading <3

Intro

Hello everyone,

Today we cover entropy and the heat death of the universe.

The previous chapters can be found here and here. While I recommend you read both, you should at least read the first part and skim the second.

A collection of all topics covered can be found here: https://tildes.net/~tildes/8al/.

Subject

Intro

Entropy describes how chaotic a system is. In thermodynamics, chaos is created from an irreversible process. We are all sort of familiar with this concept. A broken cup will not unshatter itself. As a consequence of how our universe works, (net) chaos can only increase. And this might have far reaching consequence, if we look at the effects of entropy on a cosmic scale.

Entropy

Entropy describes an amount of irreversible chaos.

But first, let's cover cycles super quickly. In thermodynamics, a very important concept is a "cycle". A cycle is a repeating process, that returns to its initial condition. For instance, when we ride a bike. We're turning our feet around the crank shaft. Repeatedly returning to the same position we started from. As we push on the pedal, some of our work is lost and turned into heat. Primarily due to friction from the wheels and from the different mechanical parts.

A cycle that wastes no energy is called a reversible cycle. That would mean 100% of the work in a cycle (even the work that is turned to heat) has to be returned in some way to its original state. The most famous example of this is the Carnot heat engine.[1] But in reality, the Carnot heat engine is nothing more than a theoretical engine. As we remember from before, we cannot turn 100% of heat back into work. So any heat engine, be it a car's motor, a refrigerator, a star, or the human body, will in some way contribute to this irreversible chaos.

Now what about entropy? If we look at entropy at the molecular level, it all becomes a bit abstract. But we can think of this concept with bigger building blocks than molecules, and still be close enough. Say you have a brick house with orderly layed bricks. This house would love to come crashing down. And lets imagine it does. When the house lays in ruins, it is not likely to suddenly "fall" into the shape of the house again. So if the house has collapsed, our system is in a higher state of chaos. Our entropy has increased. And unless we supply work to the system (and waste energy trough heat), we will not get the brick house back.

So now we understand, that on the grand scale of the universe, entropy will only increase.

The heat death of the universe

But what are the consequences of this? Imagine entropy going on for billions and billions of years. Everything in the universe slowly reaching a higher state of chaos. Everything that is orderly, turns into chaos. All high quality energy has turned into low quality energy. Everything has been wasted and turned into heat. Everything ripped apart until you are left with nothing to rip apart. At this point, there is no interactions between molecules any more. Everything has reached absolute zero temperature.

At this point, entropy is at its absolute maximum. And we have reached entropic equilibrium.

This is the heat death of the universe.

Afterword

Of course, the heat death of the universe is just one of the many theories about the end of the universe. It assumes that thermodynamics properly describes the universe, and that there are no hidden surprises.

Frankly told, it's the best bet we have with our current knowledge. But we still know so little. So I would not panic just yet. Alternatively, this is where we could continue with "an engineer's perspective on existensial nihilism". But I think that this is something better reserved for later, and better presented by someone else.

We have covered what I consider the absolute minimum of thermodynamics, that still gives us a basic understanding of thermodynamics. There are of course a lot of other topics we could cover, but thats it for now. I will potentially write an appendix later with some questions or things that have been asked.

But for now, that's it. Questions, feedback or otherwise?

Notes

[1] The Carnot heat cycle is a bit beyond the level of what we have discussed so far. It describes a system where heat is supplied and removed to have a piston expand and contract without any energy becoming waste heat.

Some people have mentioned they'd like to have some sort of weekly track-sharing thread, so let's have a little fun and find some good music in the process.

Everybody's got that playlist somewhere with all of your favorite earworms - the songs you put on repeat to the point where you annoy the hell out of everyone else in the room because you love them so much. Let's collect some of those earworms here and see what we can come up with.

In particular, let's go for the uplifting kind - feel good music. When the thread settles down I'll pull these all together in a nice playlist and share that here as a separate link submission.

Any time period, any genre, any style, popular, obscure, or even your own music, it's all good - just as long as it's positive energy and you can't stop spinning it. If you're on mobile, don't worry about making it into links, others can linkify it for you (and eventually, Tildes can do that automatically to make this all easier in the future). Share as many as you've got. If you've already got a playlist like this for yourself, you can share that too. ;)

Oh, and don't worry about nebulous 'standards' or if people will like it. If you like it, that's all that matters. Don't overthink it!

Edit: Almost forgot, feel free to make suggestions for the topics of upcoming share threads in the next few weeks!

What are you reading currently? Fiction or non-fiction, any genre, any language! Tell us what you're reading, and talk a bit about it.

Past weeks: Week #1 · Week #2 · Week #3 · Week #4 · Week #5 · Week #6

Welcome to the 23rd week, it had to come eventually...another classic record discussion: The Dark Side of the Moon by Pink Floyd! Posting a little early since I'll be busy celebrating Thanksgiving, have a great day everyone.

The Dark Side of the Moon is the eighth studio album by English rock band Pink Floyd, released on 1 March 1973 by Harvest Records. It built on ideas explored in Pink Floyd's earlier recordings and performances, but without the extended instrumentals that characterised their earlier work. Its themes explore conflict, greed, time, and mental illness, the latter partly inspired by the deteriorating health of founding member Syd Barrett, who left in 1968.

Developed during live performances, Pink Floyd premiered an early version of The Dark Side of the Moon several months before recording began. New material was recorded in two sessions in 1972 and 1973 at Abbey Road Studios in London. The group used advanced recording techniques at the time, including multitrack recording and tape loops; analogue synthesizers are prominent, and snippets from interviews with Pink Floyd's road crew and others provide philosophical quotations. Engineer Alan Parsons was responsible for many sonic aspects and the recruitment of singer Clare Torry, who appears on one track. The iconic sleeve was designed by Storm Thorgerson; following keyboardist Richard Wright's request for a "simple and bold" design, it depicts a prism spectrum, representing the band's lighting and the record's themes.

The Dark Side of the Moon produced two singles: "Money" and "Us and Them". The album topped the Billboard chart for a week, and remained on the chart for 741 weeks from 1973 to 1988. Following a change in how Billboard counts sales in 2009, it re-entered the chart and has since appeared for over 900 weeks. With estimated sales of over 45 million, it is Pink Floyd's bestselling album and one of the bestselling worldwide. It has been remastered and rereleased several times, and covered in its entirety by several acts. It is regarded as one of the greatest albums of all time.

Here's the place to discuss your thoughts on the record, your history with it or the artist, and basically talk about whatever you want to that goes along with The Dark Side of the Moon! Remember that this is intended to be a slow moving thing, feel free to take your time and comment at any point in the week!

If you'd like to stream or buy the album, it can be found on most platforms here.

Rather than get an obscure record this week, I'd love to hear from you in responses to this comment!