When you open the door of a refrigerator, the internal environment is exposed to warmer air from the room. As warm air enters the fridge, it comes into contact with the colder objects and air inside. This temperature difference creates convection currents, which are responsible for the movement and shaking of items inside the fridge.
Here's how it works:
Warm Air Enters: When you open the refrigerator door, warm air from the room rushes into the fridge. This warm air is less dense than the cold air inside the fridge.
Convection Currents: As the warm air comes in contact with the cold air inside, it cools down and becomes denser. The denser, cooler air sinks while the warmer, less dense air rises.
Movement of Items: As the warm air rises, it can disturb the items inside the fridge. This movement can cause items like bottles, containers, or fruits to shift or shake.
Closing the Door: When you close the refrigerator door, the warm air stops entering, and the convection currents gradually dissipate. As a result, the items inside the fridge return to a state of rest.
Additionally, the compressor of the refrigerator is responsible for maintaining a steady temperature inside the fridge. When the door is closed, the compressor starts cooling the air again, ensuring that the fridge maintains its set temperature. This cooling process also contributes to stabilizing the items inside.
It's worth noting that the movement and shaking of items inside the fridge when the door is open are usually subtle and may not be noticeable in all situations. The extent of the movement depends on the temperature difference between the warm air entering and the cold air inside the refrigerator.