To the human eye, a microchip (IC) looks like a solid block of black plastic. It looks waterproof. It feels hard. But to a molecule of water, that plastic is like a sponge. Epoxy molding compounds are Hygroscopic. They absorb moisture from the air. If you leave a tray of chips sitting out in a humid factory in Chennai or Delhi for a few days, they will silently soak up water vap... https://cometenvirons.com/