I have observed a phenomenon that I find hard to understand.
A plastic, melamine like dish is filled with food (spaghetti, chile, soup, etc.) The dish and food is heated in a normal microwave oven for several minutes. When it is pulled out, the food is steaming and the dish is also somewhat hot. The food is consumed over the next couple of minutes and the empty dish is left on the counter. Now in my estimation the slightly hot dish should cool off until it reaches the ambient temperature of the room and then stay at that temperature until possibly used for another meal. However what I have observed is that the dish cools to room temperature, but then keeps on cooling. If the dish is picked up 10 or 15 minutes later, the bottom is close to ice cold.
Can anyone explain what may be happening?