Entropy conversion refers to the process of converting entropy values from one unit to another. Entropy is a measure of the disorder or randomness in a system and is often expressed in units such as joules per kelvin (J/K) or calories per kelvin (cal/K). 

Entropy conversion may be necessary when working with data or equations that use different units of entropy. For example, if you have entropy values given in units of J/K but need to use them in a calculation requiring units of cal/K, you would perform an entropy conversion to ensure consistency and accuracy in your analysis.

Similar to enthalpy unit conversion, entropy conversion ensures that entropy values are expressed uniformly across different measurement systems or units, facilitating communication, calculation, and comparison in various scientific and engineering contexts.