PCM are classified into two main categories: organic and inorganic. Organic PCM are composed of carbon, hydrogen, and oxygen atoms and have relatively low melting points. Inorganic PCM, on the other hand, are composed of metals, salts, or eutectic mixtures and exhibit higher melting points. The choice of PCM depends on the specific application and required thermal properties. ECU car vs. PCM car vs. ECM in car While ECU, PCM, and ECM are often used interchangeably, there are slight distinct...