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Refrigerator

✨ The freshness cabinet

A refrigerator is a household appliance that keeps food and drinks cool. Lower temperatures slow many microorganisms and delay changes that cause food to spoil. It does not simply “make cold”: it moves heat from inside the cabinet into the room. A compressor circulates a refrigerant through a closed circuit.

In the evaporator, the refrigerant absorbs heat as it evaporates. The compressor then raises its pressure, and the refrigerant releases heat through the condenser, usually at the back or underneath the appliance. It becomes liquid again, and the cycle repeats. A thermostat or electronic sensor monitors the temperature and controls cooling.

The main compartment is often a few degrees above 0 °C, while the freezer is usually around −18 °C. Insulated walls and a door seal reduce heat entering from outside. Opening the door lets warmer air in, so extra heat must be removed. Moisture can condense on cold surfaces and form frost when it freezes, especially in the freezer.

Some models use fans to distribute cold air, while automatic defrost systems periodically melt accumulated frost. Refrigeration slows food spoilage, but it does not preserve food indefinitely: storage time depends on the food and its conditions. Closing the door promptly, leaving room for air circulation, and following storage instructions improve efficiency.

💡 Did you know?

Do you know how people managed before the fridge was invented? They used 'iceboxes': these were very thick wooden cabinets insulated with straw. Large blocks of ice delivered by trucks were put inside to keep food cool for a few days!

Why does the fridge door sometimes 'stick' when you try to reopen it right away? It's because the warm air that entered cools abruptly and takes up less space. This creates a small force that sucks the door inwards. It's proof that your fridge is working hard to make cold!

There are very original fridges in the world! Some don't use electricity. They are called 'desert fridges': these are two clay pots one inside the other with wet sand between them. As it evaporates, the water cools the central pot. It's great for keeping vegetables fresh without an electric outlet!