I Entropy Change in Time of Universe

1. May 5, 2017

Arman777

Is there something like $\frac {dS\dt}=...$ Like in the general system,

I know its always positive but I want to know is there any constant quantity of the universe like universe entropy increases amount of 45J/C or something like that.Or it depends only the knows closed systems which we ca find numerical values.
Thanks

2. May 5, 2017

Staff: Mentor

No.
It is problematic to define an "entropy of the overall universe", but no matter what you do, the time derivative is not constant.

3. May 6, 2017

Arman777

Yeah you are right it cannot be constant.I see well thanks then