Recent content by Joe

Thank you Anand. That was my understanding too. In the above equations, they consider the change in the entropy and its relation to temperature; whereas, in the Third Law, it's the value of the entropy - or lack of change in entropy - at a given temperature. I may still be wrong! I really...

Thank you. As you said, I have to get a better grasp of the entropy and thermodynamics.

Because the most ordered state of the universe would be at the coldest temperature. If the universe is already expanding and getting colder, that would mean it is moving towards the most order (low entropy?). On the other hand, it's said that expansion of the universe, from the Big Bang till...

Thank you, Dale. So, the entropy of the universe does go up as it cools down. And yet, does this not contradict the third law of thermodynamics: "The entropy of a system approaches a constant value as its temperature approaches absolute zero. "?

I saw another post about dS = dQ/T, but the subject of question was different - not related to the entropy of universe. This is what i understand from this formula: As the temperature goes down, the entropy goes up. Is this not the opposite (contradictory) to what entropy (disorder) is about...

Thanks again. Nicely explained!

Thank you. From what I understood - from your edit - light can seem to be stationary? Two photons traveling alongside each other will seem not moving from each other's perspective?

If you were to travel alongside a train, as fast the train, to you the train would seem stationary. I read that if you were to travel along a photon of light, as fast as the speed of light, that photon would not seem stationary. Is this true? If so, why?