Calculadora de Entropia

The Entropy Calculator allows you to compute the change in entropy (ΔS) of a system in a reversible process, using the formula ΔS = Q/T, where Q is the heat exchanged (in joules) and T is the absolute temperature (in kelvin). Entropy is a measure of the disorder or randomness of a thermodynamic system. This tool is useful for students and professionals in physics and engineering who need to analyze thermodynamic processes.

To use the calculator, enter the value of heat exchanged (Q) and the temperature (T) at which the process occurs. The result is the entropy change in joules per kelvin (J/K). Remember that the formula is valid only for reversible and isothermal processes. In irreversible processes, the entropy change is greater than Q/T.

Examples of use include calculating the entropy change during the isothermal expansion of an ideal gas, the melting of a solid at constant temperature, or the heat transfer between two bodies. Entropy is a fundamental concept in the second law of thermodynamics, which states that the total entropy of an isolated system never decreases.

Precautions: ensure that the temperature is in kelvin (K = °C + 273.15) and that heat Q is positive when added to the system. For irreversible processes, this calculator does not apply directly. Also, note that entropy is a state function, so ΔS depends only on the initial and final states, not on the path taken.