## Entropy. What does this term mean?

Entropy is one of the functions of the state that determines the direction of the phenomena related to changes and energy flow. This concept is closely related to the second law of thermodynamics. What is this? Examples and simple explanation.

## 1. What is entropy?

Entropy is a concept that comes in handy when considering changes in physical and chemical systems. According to the PWN dictionary, it is one of the state functions that determines the direction of the phenomena related to transformations and energy flow. This term was first introduced by a scientist of German origin, Rudolf Clausius.

Entropy is a measure of the degree of disorder in a system and energy dissipation. It is an extensive quantity, which means that if you want to calculate its value, you have to divide the system into small parts and then sum up their entropies, similarly to volume, mass, etc.

When explaining the concept of entropy, it is worth getting acquainted with the second law of thermodynamics. It says that if a thermodynamic system moves from one equilibrium state to another without external factors (i.e. spontaneously), its entropy will always increase. Pressure in physics. Definition and calculation formula

Pressure is a quantity that determines how a given force is concentrated on the surface. Pressure is a quantity ...

## 2. Entropy - a simple explanation

For some, the definition of entropy may be simple and understandable, while for others it may be difficult to grasp. The second group of people would be more likely to find a simple explanation based on examples. Thus, you can use examples from everyday life to assimilate this concept.

Imagine clothes arranged in a wardrobe, that is, individual garments sorted and arranged. There is a logical layout - T-shirts in one part, socks in the other, pants in another. In such an organized system, finding anything is not troublesome or time-consuming - just look into the appropriate compartment to find what you are looking for.

However, for someone else, the same wardrobe can become a mess - things not arranged according to any logical pattern, introducing disorder. Then it's hard to find what you're looking for the first time. To hit, you need to check several places.

Taking a quantity as a measure of disorder, let's call it entropy, we can say that the entropy value of a disordered system is greater than that of an ordered system. If, on the other hand, we would like to move from an ordered state to a disordered state, it will be accompanied by an increase in entropy. Temperature in physics

Temperature - what is it? What is the definition of temperature? What is thermodynamic equilibrium? ...