Entropy Calculator

Calculate entropy change from heat transfer at a given temperature.

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How to Use the Entropy Calculator

Enter the heat transferred in joules and the temperature in kelvin. The calculator computes the entropy change instantly. Positive heat means energy added to the system.

About Entropy

Entropy is a central concept in thermodynamics, measuring the degree of disorder in a system. For a reversible process at constant temperature, the entropy change equals heat divided by temperature. The second law of thermodynamics states that the total entropy of an isolated system can only increase or stay the same. This principle explains why heat flows from hot to cold, why processes have a preferred direction, and sets the fundamental limits on energy conversion efficiency.

Frequently Asked Questions

What is entropy?

Entropy is a thermodynamic quantity that measures the disorder or randomness of a system. It indicates the number of microscopic arrangements consistent with the macroscopic state.

What does a positive entropy change mean?

A positive entropy change means the system became more disordered. Heat flowing into a system increases its entropy. The second law of thermodynamics states that total entropy of an isolated system always increases.

What are the units of entropy?

Entropy is measured in joules per kelvin (J/K). This reflects the relationship between heat energy and temperature in determining disorder.