New posts in Entropy

$dU=dQ$ and $dU=TdS$, but $dQ$ not always equal to $TdS$? Why?

Does entropy decrease if time is reversed?

How can entropy increase in quantum mechanics?

Defrosting a chicken breast and the laws of thermodynamics?

Entropy and gravitational attraction

How is entropy a state function?

Does entropy depend on the observer?

Do the results of statistical mechanics depend upon the choice of macrostates?

Why does time not run backwards inside a refrigerator?

Does gravity break time-reversibility on the microlevel?