Science and Astronomy Questions
Posted: 08 Jun 2019 18:12
Propulsion Disk wrote:default0.0player wrote:Source of the post If a civilization is powerful enough to create a universe, could they do entropy reduction to survive the Heat Death?
Let's first take a look at what entropy is. let's start with an example, say it's winter and it's freezing outside, so, you turn your heater on (or up). the tempertures are now different inside and outside and therefore the entropy is low outside, and high inside. the hot air molecules in your house give off their heat energy to the cold air molecules outside, and over time the heat energy is evenly distributed amongst the two systems, and they have reached thermodynamic equilibrium, this is the increase in entropy. Therefore entropy is the movement towards thermodynamic equilibrium, and since energy is always conserved, hence the first law of thermodynamics, entropy must increase, hence the second law. Now back to your statement, as Stellarator said, "Increasing entropy overtime in a system is the natural result of that system existing." because of the particles' energies within a closed system, in this case that closed system is the entire universe, but the universe isn't very closed, in fact, it's infinite, therefore all the energy in the universe will eventually be evenly spread out amongst an infinitely huge universe, even to this day on it's way to higher infinities, and since any elementary particle, massive or massless is an energy wave, hence QFT and the mass-energy equivalence E = mc2, they will too be smeared across our universal plane, that is the heat death of the universe, or rather cool death because the energy will be smeared out amongst an infinite universe and therefore be infinitely low, or as low as it can be, but i'm getting off track. Now you should see, that there is no way to reverse entropy like that, all we could do is ether make a giant cold substance for the energy to go into, still increasing entropy, or make a giant hot substance that would lose it's energy to the cold and once again increase entropy, but nothing that would stop our demise, no matter how advanced we, or other civilizations might be.
PS sorry for all the "amongst"'s "hence"'s and "infinite"'s, this post was way to redundant.
I have something that I cannot understand. Just after a Big Bang. The universe is very small and hot. It would reach thermodynamic equilibrium long long before today. One probable explanation is that the Universe spend most of its time in a Heat Death. However anything could happen in a very very long time, so after a sufficient time the entropy decreased to a extent to allow civilization to survive