Impact of sign on area definition change according to sign of function

Sign Convention

What is sign?

Sign Convension

What will be the sign of entropy change during adsorption ?

If any two rows (or columns) of a determinant are interchanged then the sign of a determinant changes.

(i) If a + sign precedes a symbol of grouping the grouping symbol may be removed without any change in the sign of the terms.

Predict the sign of entropy change for each of the following changes of state.

Predict the sign of entropy change for each of the following changes of state.