In this sense, entropy is a measure of uncertainty or randomness. Entropy is also a measure of the number of possible arrangements the atoms in a system can have.In quantum mechanics, entropy translates to the ability to measure and manipulate the system based on the information gathered by measurement.The entropy of an object is a measure of the amount of energy which is unavailable to do work.Entropy is a measure of the randomness or disorder of a system.Such a state is more disordered than the original state in which all the molecules were in one half. With time, by chance, there will be a time, when all the balls will be in the left or right half, but it’s overwhelmingly more probable that there will be roughly equal numbers in the two halves. If the partition is removed, the molecules tend to spread out and occupy both the halves of the box. Initially, if the molecules were moving on the right side of the box by a partition. Due to this collision, they exert pressure on the walls. Now raise the temperature of the gas, we’ll notice that the molecules start to move faster, and they frequently collide with the walls of the box. Consider the molecules to be snooker balls that are continuously hitting the walls of the box and colliding amongst themselves. Imagine a system of gas molecules in a box. And when two systems are somehow joined together, the entropy of the combined system is greater than the sum of entropies of the individual systems. The second law of thermodynamics states that the entropy of an isolated system always increases. He found that the entropy of a closed system will always increase. Rudolph Clasius was the person who coined the term. The word entropy came from the study of heat and energy in the period 1850 to 1900. Our common experience says that disorder will tend to increase if things are left to themselves - That’s entropy in simple words! The second law of Thermodynamics forms the basis of this principle. Entropy is often called the arrow of time because matter in isolated systems tends to move from order to disorder. The arrow of time takes the concept even further ahead. In explaining our universe in terms of entropy, we’ve to consider how and why molecules and atoms are arranged in a definite way. Boltzmann took this concept further and related to the total number of microstates of a system. It was while taking into consideration this concept that entropy came into being. It all started with the second law of thermodynamics which states heat always flows from hot to cold. The concept of impermanence has evolved and taken the form of entropy in the language of science.
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