سوال ۲۲ کنکور ارشد فیزیک ۱۴۰۵

Read the excerpt from paragraph 2 of the passage and answer the question.

"To provide a quantitative measure for the direction of spontaneous change, Clausius introduced the concept of entropy as a precise way of expressing the second law of thermodynamics. The Clausius form of the second law states that spontaneous change for an irreversible process in an isolated system (that is, one that does not exchange heat or work with its surroundings) always proceeds in the direction of increasing entropy. For example, the block of ice and the stove constitute two parts of an isolated system for which total entropy increases as the ice melts."

The underlined word “its” in paragraph 2 refers to ……………… .