## First Law

$\Delta U=q+w$

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

### First Law

I might be way over my head in this concept, but if the Universe is theoretically constantly expanding, how can we say that energy can neither be created or destroyed? Does that mean that matter is just expanding further into the universe and therefore further from the Earth, and consequently the Earth will slowly be pulled apart and the matter will disband? I have so many questions about this. I guess space doesn't have boundaries so this is in a sense, arbitrary. Anyway I couldn't continue studying without putting this question out there because I feel like I'm missing something regarding the concept of the First Law of Thermodynamics.

charleejohnson1L
Posts: 99
Joined: Fri Aug 30, 2019 12:17 am

### Re: First Law

If we took that into consideration, we could never use measurements because they'd always be expanding or growing or something like that. Chem's a lot easier if you don't think super deep about it haha. :)

KBELTRAMI_1E
Posts: 108
Joined: Sat Jul 20, 2019 12:17 am

### Re: First Law

charleejohnson1L wrote:If we took that into consideration, we could never use measurements because they'd always be expanding or growing or something like that. Chem's a lot easier if you don't think super deep about it haha. :)

Thank you for responding!! This relieved a lot of my anxiety around the subject.

alex_4l
Posts: 109
Joined: Thu Sep 26, 2019 12:18 am

### Re: First Law

In regards to the question of matter having a sort of "limit," in astronomy it's explained that every source of matter is concentrated into different things and recycled over time (example: when we die our bodied and energy and released back into decomposition and when a super nova occurs it releases elements and pieces that make up new planets and add onto others. In relation to the idea that the universe is expanding and what happens to matter since there is only so much, that topic hasn't really been fully figured out but the theory is that the universe just spreads out like a piece of dough being rolled out thinner and thinner and the matter itself is more concentrated in other areas than others. Hope that makes sense and helps put your mind at ease :)

alex_4l
Posts: 109
Joined: Thu Sep 26, 2019 12:18 am

### Re: First Law

Also, this theory might not be 100% the truth of what is going on with matter while the universe is expanding because it's just an idea and cannot be proven from our knowledge and understanding until technology advances to a more extreme level. However, this is the most common and easiest to understand idea

Sreyes_1C
Posts: 90
Joined: Fri Sep 28, 2018 12:19 am

### Re: First Law

Dang, studying for the midterm but this question has me curious now. I honestly have no idea but if we are trying to put it in context of that law, I guess matter isn't being created but rather expanded and recycled. But then again I don't know much about space and the universe. it'd be really crazy if all our understandings of science turn out to be wrong one day.