When you close the door of your fridge, a seal is formed between the door and the fridge itself. This seal is designed to be tight for several reasons:
Temperature regulation: The tight seal helps to maintain the desired temperature inside the fridge. It prevents warm air from entering the fridge and cold air from escaping, which helps to keep the contents of the fridge cool.
Energy efficiency: The tight seal minimizes the exchange of air between the inside and outside of the fridge. This reduces the energy required to maintain the desired temperature, as the fridge doesn't need to work as hard to cool down warm air that enters.
Condensation prevention: The seal helps to prevent condensation from forming on the inside surfaces of the fridge. Condensation can lead to moisture buildup, which can negatively affect the freshness and quality of the food stored in the fridge.
Due to the design of the seal and the pressure difference between the inside and outside of the fridge, it may become difficult to open the door immediately after closing it. This is because the air pressure inside the fridge is slightly lower than the outside pressure, creating a suction effect that holds the door tightly closed. This effect is more noticeable if you try to open the door immediately after closing it, as the pressure difference hasn't equalized yet.
To overcome this, you can wait for a brief moment or try gently pulling on the door to break the seal before opening it fully. Additionally, some fridges have a release valve or mechanism that allows you to equalize the pressure and make it easier to open the door.