In a closed system, entropy never decreases; it only stays the same or increases. This is why time moves in one direction. You can turn an egg into an omelet (increasing entropy), but you can’t turn an omelet back into an egg.
Two Ways to View Entropy:Thermodynamic Entropy ($S$): The measure of energy in a system that is no longer available to do work. As energy spreads out (dissipates), it becomes less "useful."
Entropy is a measure of disorder, randomness, or uncertainty within a system. While it sounds like a fancy word for "a mess," it is actually one of the most fundamental laws of physics—the Second Law of Thermodynamics.
Researcher Note:
Information Entropy: In communication, entropy is a measure of "surprise" or uncertainty. If I tell you "the sun will rise tomorrow," that has low entropy (high predictability). If I tell you something totally unexpected, that has high entropy.
Information Entropy: In communication, entropy is a measure of "surprise" or uncertainty. If I tell you "the sun will rise tomorrow," that has low entropy (high predictability). If I tell you something totally unexpected, that has high entropy.