Phase-Change Materials (PCMs) [caption id="attachment_521" align="aligncenter" width="277"] Ice Cubes (from BedTimes Magazine)[/caption] Consumers now occasionally see the terms “phase-change materials” or “PCM s” in descriptions of clothing or bedding. Each season, more manufacturers use PCMs in their products, some even making them a selling point. Even a casual reading tells us that phase-change materials have something to do with comfortable temperatures. More exactly, PCMs are...