The first law of thermodynamics states that the energy of the universe is constant, but the universe is constantly expanding, so how does the energy stay constant considering the expansion?

Question

I think this is physics based(?), but I thought of this question during my summer chemistry course, so I wasn’t sure of the flair.

In: Physics

Answer 1

I could be way off on this one but an analogy that may make sense would be a water balloon?

so the universe has a constant amount of energy right but let’s say some how all of it (a gallon of water for example) was squeezed down into the size of a pea then let go… the gallon of water forced into a pea size would obviously expand very quickly and make the water balloon expand with it but ultimately the amount of energy (the water) would stay the same. as it gets stretched it becomes calmer and more relaxed as the pressures are released but instead of happening instantly it takes trillions of years if not more to happen.

i would like to hear from anyone else that knows more on subject if this is a correct way of thinking.