Heat death:
condition when there is no ( physical / biological / chemical )changes occur is known as heat death of universe.
'There are some things we need to know to understand about the heat death of universe.
Like what is entropy, processes(reversible or irreversible)'
click here to understand about entropy...
[ reversible process is processor which can reverse to its initial state. it is ideal state, whereas ir-reversible process is process which cannot reverse to its initial state]
[Entropy is the measure of disorder of a system]
Suppose there is a refrigerator and a surrounding.
If you consider the refrigerator, the temperature inside the refrigerator is less than the surrounding, and it decreases with time.
But how is it possible? this is violation of 2 law of thermodynamics.
[ The Second Law of Thermodynamicsstates that the state of entropy of the entire universe, as an isolated system, will always increase over time. The second law also states that the changes in the entropy in the universe can never be negative]
So here let me tell you that work is being done to reduce the temperature of refrigerator.
The refrigerator coil is plugged in and takes electric energy. Stand alone we can't consider refrigerator as isolated system.
[An isolated system is a thermodynamicsystem that cannot exchange either energy or matter outside the boundaries of the system ]
It is worked from outside.Therefore, one who is working will also have to be consider in this thermodynamic system.i.e[refrigerator + surrounding]
the refrigerator continuously releases the heat energy from behind which maintain low temperature of refrigerator.
And if we look at the surroundings, we will find that temperature of surrounding is increasing.
#So if we look at the entire system ie (universe) then the entropy of the whole system is increasing.#.
There is a lot of concentrated heat energy in the sun, it is continuously releasing the energy,
and the rise of entropy is the basic feature of the Universe... Entropy of universe is continuously increasing.
This will go on and there will come a time when the energy density in universe will be equal.i.e
(Temperature of universe will become same at each and every point).
This is known as heat death of universe, at this stage there will be no transfer of energy/heat.
No mechanism will work :physical engine(machine), living engine(living beings).
This is known as death of universe.
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