Entropy is defined as:

Entropy is defined as:

• A. A measure of order
• B. A measure of disorder or randomness
• C. A measure of efficiency
• D. A measure of cohesion

Answer: (B)

Entropy describes the degree of disorder or randomness in a system. It counts how many microscopic configurations (microstates) correspond to what you can observe at a macroscopic level (the macrostate). When there are many possible microstates, the system is more disordered, and entropy is higher. This idea also shows up in information theory, where entropy measures how uncertain or unpredictable a message is on average. Think about a gas spreading to fill a room: the particles disperse from an orderly, localized state to a more mixed, random distribution, so the entropy increases. Entropy is not a measure of order, efficiency, or cohesion—the opposite of entropy is a more ordered, more structured state.

Entropy describes the degree of disorder or randomness in a system. It counts how many microscopic configurations (microstates) correspond to what you can observe at a macroscopic level (the macrostate). When there are many possible microstates, the system is more disordered, and entropy is higher. This idea also shows up in information theory, where entropy measures how uncertain or unpredictable a message is on average.

Think about a gas spreading to fill a room: the particles disperse from an orderly, localized state to a more mixed, random distribution, so the entropy increases. Entropy is not a measure of order, efficiency, or cohesion—the opposite of entropy is a more ordered, more structured state.