Why does chicken soup bubble in refrigerator?

Chicken soup doesn't actually bubble in the refrigerator. It's more likely that you're seeing condensation forming on the surface of the soup. Here's why:

* Temperature difference: The cold temperature inside the refrigerator causes the air inside the container to cool down. This cooling makes the air less able to hold moisture.

* Water vapor condensation: The water vapor in the air condenses on the cold surface of the soup, creating droplets that look like bubbles.

* Fat separation: If the soup has a lot of fat, it may separate and float to the top, forming a layer that traps air bubbles. These bubbles can appear as if the soup is bubbling.

Important note: If you notice any actual bubbling or fizzing in your soup while it's in the refrigerator, it might indicate spoilage. The soup should be discarded and not consumed.